All Things Mk5 > Performance Modifications
Shark Performance Stage 1 to Stage 2.......
56OctyVRS:
The sports cat down pipe is the front section of the exhaust that fits to the turbo. The cat back fits after the cat and goes to the exhaust tips on the rear of the car. The cat back is not needed at any stage of tune really, as the restriction is in the oe down pipe. I have a BCS full TBE fitted purley for the sportier exhaust note :evilgrin:
E30Dom:
--- Quote from: 56OctyVRS on June 29, 2012, 03:10:59 pm --- The cat back is not needed at any stage of tune really, as the restriction is in the oe down pipe. I have a BCS full TBE fitted purley for the sportier exhaust note :evilgrin:
--- End quote ---
I don't believe that... going from 3" to 2.5" oem cat back is going to require a reducer which is bascially a bottle neck and will cause reduction in flow... imo of course.
If you need a reducer pipe from a 3" downpipe to a oem cat back i have one for sale if you go this route...
Janner_Sy:
--- Quote from: E30Dom on June 29, 2012, 03:26:20 pm ---
--- Quote from: 56OctyVRS on June 29, 2012, 03:10:59 pm --- The cat back is not needed at any stage of tune really, as the restriction is in the oe down pipe. I have a BCS full TBE fitted purley for the sportier exhaust note :evilgrin:
--- End quote ---
I don't believe that... going from 3" to 2.5" oem cat back is going to require a reducer which is bascially a bottle neck and will cause reduction in flow... imo of course.
If you need a reducer pipe from a 3" downpipe to a oem cat back i have one for sale if you go this route...
--- End quote ---
The gains from a Cat back exhaust are negligible. Ill see if i can did out the dyno sheets i have. i gained 0.3hp or something like that iirc. that was a before and after run.
performance gains = downpipe
noise gains = cat back
TBE= performance and noise.
I ran the 3" downpipe for a couple years before getting a CAT back. I only had the CAT back on for around a month before removing it as it gave no gains and just droned. Not bothered about getting one for my current car either tbh. maybe if i get one with the power valve to reduce droning
Spencer78:
--- Quote from: Janner_Sy on June 29, 2012, 03:30:07 pm ---
--- Quote from: E30Dom on June 29, 2012, 03:26:20 pm ---
--- Quote from: 56OctyVRS on June 29, 2012, 03:10:59 pm --- The cat back is not needed at any stage of tune really, as the restriction is in the oe down pipe. I have a BCS full TBE fitted purley for the sportier exhaust note :evilgrin:
--- End quote ---
I don't believe that... going from 3" to 2.5" oem cat back is going to require a reducer which is bascially a bottle neck and will cause reduction in flow... imo of course.
If you need a reducer pipe from a 3" downpipe to a oem cat back i have one for sale if you go this route...
--- End quote ---
The gains from a Cat back exhaust are negligible. Ill see if i can did out the dyno sheets i have. i gained 0.3hp or something like that iirc. that was a before and after run.
performance gains = downpipe
noise gains = cat back
TBE= performance and noise.
I ran the 3" downpipe for a couple years before getting a CAT back. I only had the CAT back on for around a month before removing it as it gave no gains and just droned. Not bothered about getting one for my current car either tbh. maybe if i get one with the power valve to reduce droning
--- End quote ---
That's really interesting Janner. Is there any noise gain with the downpipe at all? Would like a bit more noise to be honest but not much and certainly not a drone, particuarily at motorway cruising speeds on part throttle.
Janner_Sy:
You get a deeper burble. Almost like a focus ST which I thought was perfect
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