All Things Mk5 > Performance Modifications

Best exhaust diameter for KO3

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GTI_Kyle:
Thanks Dan_FR  :happy2: would a different backbox increase power in any way?

AJP:

--- Quote from: GTI_Kyle on March 01, 2016, 01:01:19 pm ---Thanks Dan_FR  :happy2: would a different backbox increase power in any way?

--- End quote ---
No. Spend your money elsewhere if you're after power.

GTI_Kyle:

--- Quote from: AJP on March 01, 2016, 02:37:13 pm ---
--- Quote from: GTI_Kyle on March 01, 2016, 01:01:19 pm ---Thanks Dan_FR  :happy2: would a different backbox increase power in any way?

--- End quote ---
No. Spend your money elsewhere if you're after power.

--- End quote ---
Wont the stock catback/backbox restrict power at stg2+?

AJP:
No. Maybe, and that's a huge maybe, there's one or two bhp to free up.

99% of exhaust restriction on these cars is at the cat(s) and downpipe.

Generally, the reason people go for a full exhaust from the likes of Milltek or Powervalve, rather than just the downpipe and cats, is to achieve a bit of a sweeter exhaust note along with the extra power from the downpipe.

A HPFP upgrade is the best next step for power after doing the downpipe.

AJP:
If you're at 2+ you should have uprated the downpipe, fuel pump, intercooler, and intake.

Next step then is bigger turbo.

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