MK5 Golf GTI
All Things Mk5 => Modifications & Technical Area => Performance Modifications => Topic started by: rashg60 on May 31, 2015, 06:11:05 pm
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I need some advice. I am thinking of going for this:-
http://www.ebay.co.uk/itm/golf-mk5-gti-3-Exhaust-Down-Pipe-High-Flow-Sports-Cat/300361586764?_trksid=p5411.c100170.m2943&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140131123831%26meid%3D0cfd795f9f82482ab3a6e93092a96b88%26pid%3D100170%26rk%3D1%26rkt%3D15%26sd%3D300361586764
I currently have the standard exhaust system. My questions are:-
Is the most power gain achieved from the downpipe/sports cat as opposed to the rear section?
Or is it recommended to change the entire system?
Would the above downpipe/sports cat fit the standard system? Or would this require additional chopping and changing?
What are people's thoughts on the Pipewerx system?
Is it any louder?
How much power gains to be expected?
I am due for a stage 1 R-Tech remap next week, so wanted something to compliment that.
All comments appreciated :smiley:
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Ive got the pipewerx decat downpipe and love it. Sounded abit raspy when bolted to the oem cat back but now have a miltek cat back and sounds awesome. But ive got a decat one so cant say with the sport cat. It will bolt straight to the oem exhaust so dont need to do any chopping. Fit is perfect to.
as far as im aware the restrictions are mainly in the downpipe and not in the cat back part. So id get the downpipe first and at a later date get a cat back system on if funds are short.
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I had this on my old Ed30.
Saw 314bhp & 320lb/ft at R-Tech with only a panel filter & downpipe & sports cat. Sounds great with the OEM cat back, not too loud, but a great exhaust note :happy2:
Pre-map I had just shy of 260bhp so it gives around 15-20bhp. A cat back would have seen another ~3bhp :grin: at this level of tune.
The BCS sports cats are better quality and higher flowing overall, but Pipewerx is great at the price.
I had Alex @ AKS trim 1.5inches off the pipe as the tailpipes stuck out a bit too much for my liking.
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Thanks guys - it's the price that I like!
I used Pipewerx about 12 years ago for some custom made quad tailpipes on my Corrado G60 - car pic is still up on their gallery coincidentally (the yellow Corrado on the 2nd row of Sports & Saloons section):-
http://pipewerxcars.com/pw2_gallery.html
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Also, just to be clear, the vast majority of the gains are achieved by the downpipe and sports cat - so why would you spend another £450+ on the cat back system? I'd be inclined to leave it alone if it's not even another 5bhp for so much money!
Unless I'm missing something of course........
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Also, just to be clear, the vast majority of the gains are achieved by the downpipe and sports cat - so why would you spend another £450+ on the cat back system? I'd be inclined to leave it alone if it's not even another 5bhp for so much money!
Unless I'm missing something of course........
Your right. If you are after more than 330bhp then a larger bore cat back is required, but up until then the cat back is for noise and looks :happy2:
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I've finally saved up enough pennies for this but have been reading other people's thoughts on the exhausts and it appears that most people go for the 2.75 inch pipes. What are the main differences with the sizes (apart from the sizes of course)?
I just assumed that the 3inch pipes would be better as they are bigger? What is the standard size of the exhaust? Pipewerx tell me that their 3 inch pipe would fit the standard back box system.
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Standard size is 2.5inch. Milltek is 3inch downpipe to 2.75inch catback and other brands are 3inch.
i got told the milltek offers better torque but less hp. Wont be a problem on stock turbo tho.
and yes the pipewerx bolts straight onto the oem catback as it has a reducer to fit.
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Did you end up getting one of these?
Wondering does the Pipe Werx downpipe and sports cat show up used often?
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Not come across any used ones on eBay or anything but I think for that price I wouldn't mind going for new (as I'm intending to keep the car long term).
Unfortunately not ordered yet. I've had some unexpected house-related expenses come up (roof and garden shed). Gotta keep the missus happy. Exhaust money has gone on roof......nnnnnnoooooooo!!!!
It just means I have to wait another couple of months for my precious exhaust. I have decided to definitely go for the Pipewerx downpipe and sports cat though. I really cannot wait.......
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Hi mate,
not sure if you've seen this bit of info but it helps explain the importance of a free flowing exhaust system. Yes I think the main restriction is at the front end but if you want your motor to flow fully then a free flowing rear system helps.
Thanks.
http://r-techperformance.co.uk/2-0-tfsi-stage-1-guide/
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After months of deliberation I have finally placed my order for the exhaust......and I've not gone for the Pipewerx one!
After reading many reviews and other people's comments I have decided to go for the BCS full Powervalve system. A lot more money but I didn't want to regret it later. I am booked in with Nige in 2 weeks time and cannot wait.
I had the stage 1 R-Tech remap done about 6 months ago, would people recommend getting it remapped again after the exhaust system has been fitted? I am going for the 200 cell sports cat instead of a decat for MOT reasons.
Has anyone else got this system and what sort of power is expected? With the stage 1 map I am running 247bhp.
Any help/advice would be appreciated.
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I'd certainly go for a map tweak once the BCS is fitted, I'm pretty sure I've read the full turbo-back is good for 20+bhp with a map that takes it into account.
With an inlet on top you'd be at what's usually recognised as Stage 2, so being halfway there hardware-wise I'm sure a tweak to the map can get the best out of the BCS alone.
An uprated pump like Loba or APR would make things better still. Not cheap, but a good increase in midrange. You wouldn't see a massive peak bhp gain, but with the BCS you'll gain torque across the rev range, and that's what counts.
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Thanks AJP - not sure what inlet you are referring to?
I was secretly hoping the exhaust would let me get to stage 2 comfortably. How easy are the fuel pumps to fit?
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Thanks AJP - not sure what inlet you are referring to?
I was secretly hoping the exhaust would let me get to stage 2 comfortably. How easy are the fuel pumps to fit?
As in Evoms, ITG Maxogen etc. Personally, I don't think they're that necessary unless you're chasing max peak hp numbers. Plenty of people on here saying they lose a bit of low-end torque, sound chavvy etc.
I wouldn't worry too much about having exactly the right hardware for 'Stage 2' - This 'Stage' thing is just a name at the end of the day. A car with an uprated HPFP, turboback and aftermarket inlet isn't going to be completely different to an identical spec car with the factory inlet. And as R-Tech's maps are truly custom you'll get the best software for your hardware, and you can call it Stage whatever you like..
Obviously there are generic Stage 2 maps that other tuners offer that will be designed to work with certain hardware - more often than not this would necessitate an aftermarket inlet. But that's irrelevant when you're getting a bespoke map at R-Tech.
As it happens, I'm Stage 1 R-Tech, and if I decide to go for more an uprated HPFP and turbo back will be how I do it. (Also looking at a hybrid k03 but that's another story..)
Should make for a very drivable, torquey car.
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Thanks again AJP - the stage thing makes sense, it is just a number as they are custom maps. I never thought of it like that.
I've just emailed R-Tech for their advice and to book in for the 'tweak map' - I'll let you know what they say. They'll probably call it a stage 1+ map I presume?
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Thanks again AJP - the stage thing makes sense, it is just a number as they are custom maps. I never thought of it like that.
I've just emailed R-Tech for their advice and to book in for the 'tweak map' - I'll let you know what they say. They'll probably call it a stage 1+ map I presume?
I'd say if you were going to get an uprated pump as well as the BCS you'd be somewhere between 1+ and 2 in R-Tech terms. But again, no point labelling it with a number!
I'd imagine a car with an aftermarket turbo back, aftermarket HPFP and a standard inlet would be a much nicer beast than one with an aftermarket turbo back, aftermarket inlet and standard HPFP.
If you're just doing the exhaust then map tweak without a HPFP upgrade, you should see a reasonable increase in power across the rev range, maybe seeing the best increases at mid-high revs, where the standard downpipe and cat would bottleneck the flow. Again, don't look at the before and after peak hp figures to see what you gain, look at the extra area under the curve.
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Exhaust was finally fitted on Wednesday and boy has it made a difference. The first thing is the sound....absolutely awesome! Cannot ask for more. And so glad I went for the Powervalve system....I'm sure I would have regretted getting any other system!
Now booked in for my re-map tweak at R-Tech a week today. Then leaving the car alone for a while and just gonna enjoy it......
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Thanks Rash - Glad your happy :happy2:
Cheers
Nige
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2FVW_Powervalve_Systems%2FVW_Powervalve_Systems_Non_Logo%2F_DSC0157_zpsj8cca3c4.jpg&hash=634d7099d24deb477e068aa82e56d909362ab692)
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2FVW_Powervalve_Systems%2FVW_Powervalve_Systems_Non_Logo%2F_DSC0155_zpsxms6cbav.jpg&hash=3841321cddc2f929b2f2411dcde5d967bfad85cf)
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2FVW_Powervalve_Systems%2FVW_Powervalve_Systems_Non_Logo%2F_DSC0151_zpspm4j6flk.jpg&hash=c08367ce31ab2b8603c628b61a2d47fce2b63f9a)
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Brilliant Nige - thanks for uploading the pics!
I was gonna add them on here but was struggling to.
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By the way this now means I am selling my stock OEM system, including downpipe and cats.
It came off my car at 66,750 miles and is in very good condition.
Please contact me for any further information.
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Did you get the map tweeked to suit the BCS?
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Yes mate did get it done.
With the tweak it is now running at 273bhp and 347 lb/ft torque.
With a big mod like the exhaust, it makes sense to get the map tweaked to suit/take full advantage.
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Yes mate did get it done.
With the tweak it is now running at 273bhp and 347 lb/ft torque.
With a big mod like the exhaust, it makes sense to get the map tweaked to suit/take full advantage.
How's it running at the minute Rash?
Mine's in with Steve at Statller in a week. He did a quick scan and there's a fuelling fault (as I thought), but he's going to log it properly to see exactly what the issue is. Said it could be the LPFP.
I'm bracing myself a bit. Could also be an injector causing the dodgy cold idle, or a coilpack. And the fuelling error could be a worn/dead cam follower causing pump issues and worst case, camshaft damage. It had a new follower about 6k ago though, so fingers crossed.
I did pick up a Loba pump a few weeks ago, so that'll be going in regardless. Best case scenario is that is all it is; standard pump struggling and simply causing fuel cuts, and the Loba sorts it. Doesn't explain the idle though... as far as my knowledge goes!
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To be honest, mine is running very smoothly indeed and very quick. I think it was just having a bad day that day. I now take it out around once a week to give it a good thrashing and that sorts it out. I hardly drive it during the week though, so could just be that.
Please do keep me updated about your issues, just in case I experience them also. Fingers crossed I won't have to. Been lucky so far with the clutch etc.
PS - I ordered the Edition 30 front splitter (non original - was recommended by a few peeps on here and I've seen it in real life and it does look good). Anyway got some quotes for spraying that and the side skirts. Once they are done I'll put the bumper on in one go. Don't want it looking odd with just the bumper.
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I'll let you know how it goes mate. I'm probably over thinking things in regards to what could be at fault, but I suppose it doesn't hurt to be realistic about potential costs. Glad yours is running well anyway.
Looking forward to seeing some pics with all the bits painted up!