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Guest Robo's

Can you guys who have performed a before and after feeling or rwkw increase, post your experiences. For my reading this would have to be the major increase in power, as its straight after the turbo. No use having a strangled exhaust after your turbo then mating up to a gigantic cat-back exhaust. Sounds like your defeating the purpose.

:)

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there isnt any noticable kw increase however the car revs a lot nicer and feels a bit more free to drive if that makes sense. oh the car is also more responsive pick up wise and it also made my turbo spooling a lot louder. worth the money with hi flow cat of course

I noticed a gain on the 'seat of the pants' dyno... Maybe about 5-8 cheaks worth (or about 10 skid-marks in the old scale).

It also felt like it spooled up a little quicker and the boost didn't seem to drop off as much high in the rev range.

Worth the money I say.

J

I agree with the posts above. I started with a cat back 4" system and then got a front pipe and split dump. I didn't notice a massive HP gain, but it will come on boost quicker, and increase top end.

As for doing the dump/front first - if you're looking for most HP gain, then the cat back will be better value for money to start with; then do the dump/front pipe. That said, the closer the restriction to the turbo, the greater the effect on flow efficiency; for example, if i put a silencer in my rear muffler (reducing the effective diameter to say 2"), it will have less of a flow distubance and thus effect than having a 2" dump pipe and 4" cat back.

So, in conclusion, do the cat back first, then worry about the dump/front if you are strapped for the mulla. Bang for buck.

When I put my combo dump/front pipe with a separate wastegate line I noticed a fair difference. I already had a catback system too. Although I don't have any dyno figures to back it up, I feel it really helped my midrange as it felt kind of flat before hand.

Probably the best thing about it though was that the turbo was now audible ;)

EDIT: Almost forgot - My combo pipe was HPC coated, so that may have made a difference. Apparently it brings on boost sooner with the coating. If anything I felt it came on boost later, but harder.

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