Your experiences with Dump Pipes

[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.

[akeenan]

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

[Sydneykid]

HI Robo's, on RB20/25 we see 5 to 10 rwkw increases from fitting a split dump compared to standard.

[Airzone]

Just a quick one - is there any advantage to having a 3" front / dump pipe with high flow cat and a stock cat-back system? Obviously it's not going to be as good as a full 3", but as a first installment in an exhaust, I just want to know of any potential benefit.

[Guest Robo's]

Hmm, sounds good, will be one of the first mods i do

[Robo]

Nice Nickname....haha

[Jay95R33]

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

[rev210]

top end is improved, spool is a little quicker.

[silver33]

Like Airzone, I'm interested in the potential benefit of having a high flow dump and cat, mated to a stock cat-back system as an initial exhaust mod.

[Guest Boxhead]

well there must be an increase, just look at the stock dump pipes 'room' or lack there off to give airflow from the wastegate

[rob77]

I went from 235 to 245rwhp by the fitment of a dump pipe and 3" front pipe. Had full boost @ 0.85bar by 2500rpm compared to 3500rpm without the dump+front pipe. So mainly it brings boost on quicker and gives you a little more top end.

[Ronin 09]

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.

[dojobi]

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.

[Mase]

My front cut came with a 3" front pipe already on there. I've heard that people are getting more power out of twin dump pipes???? Anybody got any hard facts???

[Airzone]

I always thought that dual pipes was for people with external wastegates.

[Guest Robo's]

All in all, your exhaust is only as good as your first restriction in it

[akeenan]

my dump/front made my turbo really loud it was so good but because i lost a heat shield off the standard dump i had to buy exhaust wrap and wrap it up now it isnt as loud

[BOOSTD]

I had no improvement at all, must be a bigger restriction b4 the dump...probably the .6 A/R rb25 exhaust housing.