IT's an 88 Iroc. I bought it with some kind of Flowmaster muffler. Sounds amazing at idle, but sounds like a damn 305 or worse yet a v6 when I rev it. Then this kid I know has a 305 Camaro with a Flowmaster that sounds really deep all the time. What's the deal with that? How many different mufflers do they make?

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

well I don't know what crap sounds like but they make alot of different mufflers. but if yours is a crossflow then that narrows it down quite a bit because then the only differece is pipe diameter. but if it is just a sigle in and out thier are alot of options. go to thier website.

www.flowmastermufflers.com

it has a description of all thier muffler lines.

 

Because it's a Flowmaster

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN92, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,stock chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

Is your cat clogged? That could be hindering some air flow! I had a friend who had the same symtoms with his. Idle sounded great WOT sounded like a pick-up.

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89 Formula 305 TBI
160* stat, 200* fan switch, K&N, Headers, 3in Flowmaster (hollow cat) back, pullies, 1.6 full roller rockers, B&M trans cooler, home-made ram-air
3.73 Richmond gears and SLP Zexel Torsen Posi (waiting for install)

 

An 80 Series or 40 Series dual outlet with 3in. pipes and high flow converter, or the Flowmaster AT exhaust system, nothing sounds better on a modded or not street legal 350. How do I know, because I've heard them.

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Looking For:

87 IROC-Z28 350 TPI
The car I want.

84 TRANS AM 305 H.O.
Another car that would be OK to own while I still look for the IROC-Z!!

[This message has been edited by IROCZTWENTYGR8 (edited March 28, 2001).]

 

my 85LG4 motor never sounded that great until i gutted the cat with the flowmaster 80 series and headers offered no difference in sound at all

 

hehehe was about to say the same.

 

Do you have a cat on your car? I have heard that Flowmasters sound awesome when you do have a cat, but sound like crap when you have it removed/gutted.