Are the semi's the same diameter as the large tubes?
I heard the S/S ones pull harder up top. Anyone have any results ?

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350 TPI, 700R4(rebuilt), K&N's, MSD 6AL, Headers, Flowmaster, 160* stat, airfoil, MAF screens cut out. 13.88 @ 101.18 mph

 

Hi...

The semi has the same diameter as the large tube ones. The semi gives more power in the upper rpm's and no or minor loss at lower rpm's. TRAXION had the results read https://www.thirdgen.org/messgboard/...ML/000351.html and https://www.thirdgen.org/messgboard/...ML/000267.html

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTB, ported plenum, 52 TB, MSD 6AL, TPIS level V prom, Mod .MAF, Superior shift-kit and some minor mods. and more to come!
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)