I got my muffler cut off and now i only have a cat and a big exhaust pipe at the end is that healthy for the car. and does it make it have more horsepower

 

If you and the local cops can tolerate the noise, then your car will be fine with it too. Did you notice a difference in seat-of-the-pants power?

If its just a little too loud you could always throw a glasspack on there and it'll quiet it down a little.



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Mike L.
It ain't pretty.......

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

I'd say that it would improve air flow not having a muffler, and it would be louder too, even though I prefer having mufflers to give it a different sound.

 

My 86 IROC has factory exhaust back to the cat (not sure if the cat is factory or not) and from the cat back to the rear bumper is a large diameter pipe that splits and exits at the stock exhaust location. I get a lot of positive comments about how good it sounds and it runs great. Only problem is an occasional SES light (code 32) if I maintain the same speed longer than 4 or 5 minutes.

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Z's r Best

 

I've heard that mufflers help to equalize back pressure on our exhausts, like a crossover on a true dual exhaust. It seems to me that straight pipes would help increase power, although ive heard the opposite, but youve also got to be careful with the law...in IL, im pretty sure you legally need a muffler...cops probably won't pull you over for it, but if he wants to give you a hard time he can. I too am considering just getting rid of my muffler, but im gonna do some research on the backpressure thing

 

Look at my Sig....


I love the sound... i lost low end but i can tell the gain in high end... I'm more for racing imports and thats where they get there power... topend... Anyway.. With out the muffler it sound so much better to me...


AND yes it is LOUD>.. i was in my room and my dad started it up w/o me knowing it.. i thought there really was a race car and went to see... it was my good old Camaro...

Oh yeah.. I have no emmissions in Jax fl...

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92 Camaro 305 TBI Automatic
2.5 high flow cat, 2.5 pipes, 3.5in tip
shift kit
Tinted windows(legal)
Spark plug wires and plugs...
14X3 O.E. K&N Filter

Future mods.
Headers
any other advise on getting to 300+ HP would be appreciated. Thanks

11.0 Et @64mph on the 1/8 reaction time was 1.0+ with a 60ft at 2.5?(First run ever, didn't know which light to go on)
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System = Sony explode 5000 CD/MD receiver
Rockford 6x9 Fanatics
Rockford 4x6 Fanatics
Rockford 2 12" Hx2's
Rockford 1 farad cap
Rockford 800x2 Amp
Custom box
4gauge wire kit

 

I took my muffler and I-pipe off about a month ago. Its kinda loud (still have the cat on) and it shakes the change in the ashtray like crazy. I love the sound at WOT but cruising around it sounds kinda choppy. People love it and 95% of the people walking down the road turn their heads to look at whats rumbling towards them. People swear I'm lying when I say its all stock under the hood and assume my IROC is faster than it really is.

As for power gains I noticed it pulled more in the top-end. I didn't feel any loss in low-end.