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well just had my R33 Gtst EPA test done and completed. 3 inch all the way with stock twin tip muffler at the end, 85Db. A very big difference from the 99Db Xforce that was on before.. Very suprised that it passed, every mechanic i went to before it was tested said that "no way would it pass with just a stock muffler bolted onto the pipe." Just be carefull of mechanics trying to rip you off.. at least round the Epping area anyways... :D

Big thanks to the guys at U.S Exhausts in Thomastown, Vic. for the custom work on the exhaust and helping out when no one else would.

Now just need to find a decent twin tip muffler to replace the stock one.. :geek:

Edited by sympozium7
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Why not just get two mufflers installed to start?

Then you'd also have a EPA test (which you paid for) confirming your car was then 100% legal.

Giving you then every right to contest the next EPA notice in court :geek:

on my rb30det im running vband from turbo down with an external gate. 3 inch to cat and 3 inch through to muffler. i've been reading for months but never actually found anyone or been given clear indication of them beating the dba with aftermarket exhausts. Loacted in Nsw

can someone please shed some light with me .

car : 1993 gts with rb30det

exhaust. JJR catcback system , catco 3 way cat (justjap) . custom 3 inch front piping

i cant make sense with comlaw and adrs which state . what category my car falls under , eg. maximum db for my car is **Db to be tested at idle and up to 4800 rpm and back down while remaining under limit

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