Yes, that is correct.. it`s not goint to be installed on a supra.. but since you guys have more high hp cars than anyone, i guess you also knwo these things^ You are correct they don't make a Supra exhaust. The OP just wanted infomon a muffler with a 3.5 I.D. Just trying to help him out, PLUS Burns Stainless make top notch products. I'll be running their muffler.
I've never heard of a track that DOESN'T have a decibel limit. There are a lot of reasons for it, such as keeping noise complaints down from locals and government, allowing people to hear caution and instruction communications, and perhaps most important, preventing drivers and spectators from going deaf. I think 95 is about average for US tracks, but I could be wrong. A popular trick is finding out where the decibel reader is on the track, and driving on the opposite side, as well as (if your setup allows) dumping the exhaust on the opposite side.are you friggin serious???!!! thats one of the craziest things i ever heard, a decibel limit at a track