i want more power i need to decide between an 2.5 HKS downpipe or an HKS RS intake. Which one should i install first?

 

Intake will require a tune..So I would say downpipe.

 

I would say neither of those would be useful. You won't get any gain from a DP with the stock cat still in the middle. If you get a DP that is a one-piece design that includes the test pipe, then definitely get that. Otherwise, skip the DP. Also, don't get a 2.5" DP ever...only go 3".

The HKS RS intake will not give you any noticeable gain over the K&N, plus it will require a tune to work properly, so that's definitely not worth the money.

If you want to spend $200-250, then purchase a flash and enjoy the 20+ whp gain...

 

downpipe

 

i am going to dynoflash my ecu does the downpipe have better results or the intake help more?

 

The intake won't help that much b/c it will require a tune. The downpipe won't work b/c stock catalytic converter is the major bottleneck of the exhaust system. If you get a tune, the intake will get you more power.

 

Downpipe

 

I already answered that. You will get no gain from either, unless you consider 2whp for $250 to be a "better result."

Why do you want to purchase such an expensive intake if you already have a K&N filter? You're already getting 3-4whp from that filter and are having NO negative results in terms of hot engine air or turbulent MAF readings. The DP needs to be a 3" and needs to be combined with a cat replacement (test pipe or HFC).

 

If the ecu is flashed, Al said the intake gains 11whp i think. If the downpipe is a catdelete i would go w/ that instead of an intake.

 

i know that without tune the intake make a lean condition, but what are the results with the flash? do i keep my k&n or should i change before the flash for better results? I read a dynoflash threads and they said that Al can program the ecu for better results with an intake.

 

Wrong, the gains from the intake are on evos that already have TBE

 

the downpipe does not need to be 3 inches at all.....in fact with a stock turbo (non 10.5 hotside), it will matter very little if you go 2.5, 2.75 or 3 inch..get what fits your budget.

The downpipes that eliminate the stock cat are excellent pieces, but not everyone wants the noise. DC Sports and RSR are the 2 most popular. If you get a downpipe that does not integrate a test pipe, then you would be very well served to either mate it to a test pipe or mate it to a high flow cat.