header collector inserts

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Have any of you ever heard of or tried the collector inserts made by " Car Chemistry "? I would like to quiet my exhaust but don't have room for mufflers. Car sits pretty low.
Thanks

[THERATTLER]

I have a set hanging on my wall made by shonfeld (not spelled right) that were a disapointment ..not familiar with your brand..

[DRTRCR22]

Most circle tracks now require one of these...


http://www.speedwaymotors.com/Muffler-Collector-Inserts,4870.html

http://www.speedwaymotors.com/Schoenfeld-IMCA-Spec-Muffler,3486.html

[I972Nova]

Yes and my advice is to not waste your time. Tried them about 5 years ago and car went from 10.80's to 11.23 and blew the dipstick out from all the back pressure, took them out and went right back to normal. Have heard good things about the dynatech cone type inserts though.

Both my Novas just have cheapy Dynomax bullets on them, they dont take up much space and I like the sound of them. $30 a piece is good too...lol

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Thanks for the help. I won't waste my time or money.