Anyone using either the 12" or 16" long - 4" in/out 4-1/2" diameter Dynomax race mufflers? How loud? How bad/good?

I have a carbed 383 IROC with Hooker SC/LT headers and a Mufflex 3" to 4" y-pipe. Now I need to add a muffler (or two) for the street and remove them for racing.

I am actually thinking of running two 12" Dynomax mufflers in series or one 12" and one 16" in series to reduce sound yet retain the full 4" exhaust. Borla has a 16" muffler ($$$) as well, but they actually recommended the Dynomax mufflers to me for lower sound and cost reasons!!

Anyways, what do you guys think?

Thanks!

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, ZZ-9 cam, Edelbrock RPM intake, Hooker SC/LT headers, Edelbrock 750 cfm Carb (#1411), stock T-5, GM 3.42 rear w/Auburn posi.
Ohio Valley Dragstrip Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, TES, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hyper Chip, gutted MAF & CAT, Jacobs Ign., 53kv coil, MSD wires.

[This message has been edited by Phil87IROC (edited June 13, 2001).]