Quote:
Originally Posted by waxdass
They look the same? except for the bigger weld.
If the Tomei headers reduce the diameter (similar to the stock cross-pipe) - hows that helping performance? Since bigger x-pipes help spool and top end (on the stock manifold).
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Sorry my bad actually the Tomei headers are smaller than stock 38mm vs 42.7mm at the exhaust port, I guess Tomei's R&D showed better performance with the smaller diameter. Twinscroll headers don't have a crossover pipe so its not a restriction.
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Breakdown of the Expreme system for the GDB
http://66.163.168.225/babelfish/tran...mance_gdb.html