Upgrading to a 3" downpipe for me, means changing the elbow, removing the stock cat in favor of a 3" high flow cat or test pipe (I have a 3" RMR test pipe sitting in my garage but I can't seem to get rid of the "check engine" light even with the proper cell fix for the o2 sensor). So unless I really start to make allot of power ... the hassle and extra $ is not worth the minimal gains I would get the way my car is now ... around 280hp at the wheels. Hopefully Alfriedesq runs some tests on this subject because it is intersting. Ohhh one more thing Eric ... don't forget that my HKS is a true 2.5 (measured from the inside diam pipe). Most of the American made 3" downpipes are really like 2.85" or whatever, as they measure the diam from the outside. Is .3" or whatever really that big of a difference? My cat back is 3" (75mm) by the way.

 

A 3.0 is a must for big boost power. It will elimitae creep, that is for sure, and I plan to run a 3.0 dump off my turbo so I may need to to control the creep, how much is that 02 housing????

 

Al, I was referring to the larger HKS turbo kit ... GT 3240. Dom pipe with dump tube is 3". Still very surprising that HKS does not recommend a 3" dp with the 3037 kit. How much bigger is this turbo over stock 16G? How much bigger than 20G?

 

Comes down to cost why have another down pipe when you still can use the 2.5 the have already sold you. Mind blowing??

 

Well, when I complete my ECU mod, I should be running right around 300whp. If I can find a good, inexpensive 3" high flow cat out there ... maybe I'll try to compare a 3" dp + 3" o2 housing to my current set-up (2.5" dp + stock o2 housing) ... you win Eric, r u happy? Hmmmm ... I wonder if AMS will offering a high flow cat? Not interested in test pipes (running catless) anymore. I believe Vishnu and/or RMR may have one avail as well.

 

Anyone who installed the WORKS Reflash have before and after dyno plots yet??

 

,

I'm always happy and more so today then most. I'm might have a brand new EVO in my gorage as early as saturday if this dealer I'm dealing with will give me the trade in I'm looking for. And it is never about winning. I have seen so many set ups on the dyno and 3in always out flows 2.5. On the wrx with a larger turbo VF30 slightly smaller then a 16g with a 2.5 cat less exhaust has boost issues because of the 2.5in back presure.

Just going by what I see.

 

Lets try to keep to the topic.

Rmr or WORKS re flash.

 

My thoughts exactly

 

evo 1 - Definitely let us know how the boost controller and cat-back works with the re-flash!

JNR