Best HP gain for Cat Convertors ___ ?
Best Header gain ___ ?

for stock GSR motor setup!

 

?

 

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Search...has to be billions of these.

It all depends on environmental conditions, dyno, etc. There are way too many variables to get an exact at the wheel horsepower number for a header. Your usual DC sports header will see anywhere from 2whp-8whp...8whp would be for the JDM ITR 4-1 header w/ 2.5" collector. Custom headers will net anywhere from say 6whp-20+whp on some motors (I've seen dyno's of ITR's making 20whp with a DTR header...all stock).

A catalytic converter won't do too much. It will just alleviate some of the restriction in your exhaust system. Maybe a slight seat of the pants gain? I have seen dyno's on slightly modded cars where a fresh aftermarket cat gained 2whp. Now if your stock one is clogged (whole other story for gutted cats...) you could see a bigger gain.

If you want the craziest gains, you could spend over 1k for a custom header from DTR, SMSP, Hytech, etc... and get a minimum of 10whp over stock. You can also get SMSP's full header back setup (includes a cat I believe) and see a bit more power. Good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HONDA_TYPE_R &raquo;</TD></TR><TR><TD CLASS="quote">Search...has to be billions of these.

It all depends on environmental conditions, dyno, etc. There are way too many variables to get an exact at the wheel horsepower number for a header. Your usual DC sports header will see anywhere from 2whp-8whp...8whp would be for the JDM ITR 4-1 header w/ 2.5" collector. Custom headers will net anywhere from say 6whp-20+whp on some motors (I've seen dyno's of ITR's making 20whp with a DTR header...all stock).

A catalytic converter won't do too much. It will just alleviate some of the restriction in your exhaust system. Maybe a slight seat of the pants gain? I have seen dyno's on slightly modded cars where a fresh aftermarket cat gained 2whp. Now if your stock one is clogged (whole other story for gutted cats...) you could see a bigger gain.

If you want the craziest gains, you could spend over 1k for a custom header from DTR, SMSP, Hytech, etc... and get a minimum of 10whp over stock. You can also get SMSP's full header back setup (includes a cat I believe) and see a bit more power. Good luck</TD></TR></TABLE>

thanks man i was wondering about these custom headers, i also heard toda and mugen and dtr went up to head? and toda had the most consistent gains?

 

I've heard Toda's are good...I would rather get the DTR. Looks and overall gains are more impressive I think.

 

APC and Ractive