I'm posting this here b/c the answer might NOT be exhaust related. Well, I've pretty much been driving like a madman lately since a few mods I did and although nothing I've done SHOULD have hurt anything (shifting through gears - nothing over redline and no moving downshifts beyond 3rd) that's the only cause I can think of. My dynomax sounds like a flowmaster, or maybe when I changed the gear oil to synthetic two weeks ago I did something wrong? A note: when I sent in my dynomax warranty they said they could not warranty it for "that application." Apparently, it's a 3" truck muffler, but when I called that buffoon at summit he insisted that the mufflers were not sold in an application-specific way and I had to give him offset and diameter data. The sound (if it's not an internal exh. leak) is one like grating metal. Thanks for any replies.

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Base: 89 Iroc-Z LB9 auto 2.73 posi
Exh: 3" Dynomax muffler, 3" Pipe in place of cat
Ign: GMPP 8MM wires, Accel cap&rotor, AC Plugs
Fuel: Cleaned and flow-matched injectors, afpr, !air pump&diverter valve
Sound: Clarion deck, Kicker speakers and amps
Suspension/Drivetrain: KYB Shocks, TPIS Struts, BMR Strut Tower Brace
Misc: TB Bypass, All synthetics, Flexlite Transmission cooler
On the way: homemade 51.5mm tb and ported intake parts, 3-4 upshift valve, acc. spring, etc.

Needs valve seals; suggestions appreciated


"You say turn that volume down? Well all I gotta say to you is NO, no no no no...
I want to Rock - ROCK - I want to Rock - ROCK - I want to Rock with you..."


[This message has been edited by I ROCK (edited February 17, 2001).]