Quote:
Originally posted by HiRcc#21:
I have done alot of dyno testing different exhausts over the last 2 years and here is what we found:
on my ita crx, we found a reading of over 120hp (year old .020 over bottom end) at the wheels with this set up:
Using a new Landspeed Racing Powercore header, and a Magnaflow muffler (part# 10425). 2-1/4 in and out, 18" can.
If you measure from the flange of the header back 3" and install the muffler (edge of the can)into a 2-1/4" pipe,(with a rotateable flange and stock springs for hardware-like Lee suggested) the DB's ran at Nelson in Oct.'02 was 87. Lots of top end and it didn't hurt the bottom end either.
The straight pipe ends 7 inches after the linkage. (measured from the attachment point of the shifter to shift linkage arm.)We welded on a piece of round stock and bent it to the similar specs of a factory pipe, and used the rubber hangers to the factory "hooks" on the tub, and it works fine. No vibrations in the seat at full song.
We built approx. 15 different styles to arrive at this one.
The header, just released, gave us 2 hp over the old DC 4-2-1 with no header wrap.
Hope this helps you out... It does work!
Very helpful post, thanks alot! So you like the Landspeed header? I havent heard much about it other than it is competitively priced and I think Import Tuner got like 7whp out of the header on a D16 motor.