hey i have a 81.5mm ls vtec with pr3s, skunk2 pro2s, a blox intake manifold, and a gsr throttle body bored to 65mms and im tryin to decide if a big tube tri y (hytech knock off) or the regular dimension header would be my best bet

 

regular...

 

Extra crispy
Definitely regular for a 1.8

 

white or dark?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">white or dark?</TD></TR></TABLE>

Racist. You should have percentage deducted.

 

For your setup the regular hytech replica will be fine but can anyone post up a dyno comparison of the big tube header? Not to thread jack but I hate to make a thread on it when there is so many like this one

 

i would like to try a big tube on my setup as well...

 

from what I've seen, regular is good for to 225 whp...

 

Bigger is not always better. On my old stock block and head ITR, I actually lost a great deal of torque where I needed it most. The test engine was a stock ITR motor with Skunk 2 Stage 2 cams, AEBS intake manifold, 70mm throttle body, AEM ITR CAI, stock cat back ( no cat). Tuned on Hondata.

You can see that the JDM ITR 4-1 header smoked the Hytech Big Tube header from 5,800 to 8,100 RPM. The Hytech made more peak power, but the car was slower. However, on my high compression 2 liter race motor, the Hytech worked very well. It comes down to selecting the parts that work well with the combination that you are running.

 

good info b19

 

good info todd

 

regular will be the better one for you.

 

B19 I wouldn't expect to see a big tube header out perform something like the smaller header or a toda on a small 1.8 setup with just cams......you seem to be a pleather of information(no sarcasim intended) do you have a graph comparing the big tube on a 2.0 setup with say an smsp or rmf?

 

Hmm...good info B19.

 

Great info there... people with 1.8L need to be running a really high CR or high reving engine to benefit from the big tube version where as for the 2.0 is the way to go

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboZChatch &raquo;</TD></TR><TR><TD CLASS="quote">B19 I wouldn't expect to see a big tube header out perform something like the smaller header or a toda on a small 1.8 setup with just cams......you seem to be a pleather of information(no sarcasim intended) do you have a graph comparing the big tube on a 2.0 setup with say an smsp or rmf?</TD></TR></TABLE>