I might get the SLP exhaust on my car... that would be 3'' stainless steal pipes. But I would rather have a little more volume and lose maybe 5 horsepower. I hear that the SLP free flowing stainless steal mufflers are pretty quiet, and I was thinking about getting the 3'' stainless steal pipes, and then putting in a FLowmaster or hooker muffler to get the volume. What does everyone else think?

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1989 IROC-Z
350c.i. TPI
rebuilt 700R4 with shift kit
3'' Monza Pacesetter cat back exhaust (minus the muffler)[SOUNDS OF THIS ON MY WEBPAGE]
new dual cats
3.23 Posi rear
hypertech chip
under drive pulleys
adjustable fuel pressure regulator
K&N Air Filters
Excalibur alarm, keyless entry and remote start
new:
struts, shocks, bearings, distributor, cap, rotor, alternator, battery, regulator
245 ZR16 50 Tires, Rotors and brake pads all the way around

Go to my webpage to find out more about it.
You can also see pictures, and hear sounds as well.
http://go.to/iroc-z

AOL IMer: JRShotliff

 

Ive heard the SLP exhaust on the new SS and it sounds like sh*t i think. The stock sounds better. If I were you I would NOT get the SLP exhaust. But its your car.

 

Yeah, I have to agree. I wouldn't get the SLP cat-back either, its expensive and not that much better. I like my Hooker system a lot, it was a great buy for $260 out of Jegs. My personal favorite for cat-backs is the Random Technology one, but it costs over $330. The Hooker one looks, sounds and performes the best for those under $300.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission

Current Mods: Edelbrock TES Headers, Hooker Cat-Back System, Performance Resource Chip, 160* Thermostat, Accel 8.8mm Ignition Wires, K&N high flow air filters, gutted air box, gutted MAF sensor, Throttle Body Coolant By-Pass, Homemade Ram-Air, Falken ZIEX Z-Rated Tires.

1/4 mile times without chip:
Best ET: 15.7 @ 89MPH
Best Corrected ET: 14.5 @ 96MPH

 

I also have a 99 Trans Am with SLP Firehawk exhaust. The SLP stuff is quiet, but the cops around here ignore the Trans Am for the most part and the quiet exhaust is part of the reason. I like the stealth factor, with the SLP product.

 

guys u are all comparing LT-1 and LS-1 sounds they are different than L-98 sounds. i like my SLP cat back...its a nice low rumble...flowmaster is the biggest POS i like hooker....i guess hooker is better for the $$$ but i'm VERY happy with my SLP...and again LT-1's and LS-1's sound A LOT different than L-98's

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89 GTA 350 TPI(L-98)Fiberglass "Daytona Turbo" hood the all mighty K&N filter air foil Stage 2 Fastchip(great chip!) B&M Stage 2 shift kit Flowtech(hey they work fine) shorty headers SLP 3'' stainless steel cat-back exaust Crane Cams HI-6S igntion with PS-91 coil MacEwen white gauge overlay's SLP rear sway bar Koni's all around and one kick *** stereo! Ported plenum and SLP runners are waiting to be installed.
You can see a pic of it by going here:
http://www.hometown.aol.com/clarkemustgonow

 

I agree with fly89gta. I've had the SLP on my 'ROC since '93 and love it. Sounds somewhere in between a Flowmaster and a Borla. Mellow at cruise and downright loud when you wind it out. I've had nothing but compliments on it.

...and spank-yo-Monkie you are entitled to your opinion of course.

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Mike

'90 IROC, 5-speed, ZZ4, & Trick Flows
~~~~~~~~~~~~~~~~~~~~~~~

 

Yea guys apples to oranges.

My SLP is louder than hell. Very deep at cruise, but as soon as you open it up it gets very loud. Never heard the Hooker system so I can't comment, but I've never liked the sound of Flows.

 

There are more than one SLP exhaust and they are all different. For an F-body, there are 3 different cat backs.

1. The dual/dual. Very quiet free flowing exhaust with tips like the picture below. An option on dealer delivered 98+ Camaro SS & Firehawk ans also sold aftermarket by SLP. Some factory installed dual/duals have a restrictor plate to make them even quieter.

2. The 2 on the left (2OTL). This exhaust is also offered for thirdgens, and since I heard Gregg1LE's '91 tonight with this exhaust, it's tone is very close to my LS1 2OTL, the only difference being the idle difference (small block Chevy's sound better than an LS1 IMO). This exhaust is noticeable but not obnoxious at idle and roars at wide open throttle. It has 3" pipe from the cats going into a strait through muffler exiting through 2 side by side tailpipes on the drivers side. I really like this exhaust for a daily driven car.

3. The new "LOUDER" resonator LS1 exhaust. This is simply explained by this picture (where is the muffler)

I'm not sure about the legality but I bet this isn't the quiet exhaust someone above mentioned .

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87 Formula 350 14.81@91.64
98 Z28 1LE 13.15@107.59

 

If I didn't know better I'd swear that "louder" exhaust is the same exhaust a lot of the local Honduh "racers" are running.

Rob_O

 

i have the flowmaster series 80 on my 91 z28 (305tpi) and love it. At first i put the muffler on and it was too quiet so since then i had the converter taken off and it made it 3 times louder.At idle its not too loud but when you lay into it you can hear it from blocks away. There is one down fall with the flowmaster when you let off of it(it becomes very noisy(cracks and pops).
BUT FOR THE MONEY THE FLOWMASTER IS YOUR BEST BET.

 

I've used both Flowmaster and SLP and without a doubt the Flowmaster is a little louder(this is with headers and a 3" cat in place comparison) to the SLP but the SLP is a deeper sound and can get quite loud and still sounds good when the loud pedal is put to the floor. The Flowmaster was good and loud but was just too loud(mustang-ish) for my taste.


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Mongoose-NCTGA-1990 Pontiac Formula/305 TBI-700R4 with Edelbrock Performer TBI intake,TES headers,and STB,K&N,MSD-6AL,Holley laser shot coil,Accel Extreme 9000 wires,Jet Stage 2 chip,TCI shift kit with corvette servo,Richmond 3.73 gear with Auburn 3 series posi,3" high flow cat with SLP 3" cat back,Eibach sportline springs,Energy Suspension poly throughout,Lakewood LCA and adjustable panhard bar package,SSM subframe connectors,IROC wonder bar,Tokico 5 way adjustable struts and shocks,Autometer electric fuel pressure gauge,Alpine,JL Audio,MB Quart,92 GTA taillights,92 GTA aero wing and hatch,Steve Spohn LCA relocater kit,MacEwen White face gauges,84 T/A cold air induction air cleaner.

 

You say that the LT1/LS1 sound is very different than the L98 sound. Is it really that different? Should I put a Flowmaster on my SS or will it not sound good? That is what I am wondering about. I am looking to directly swap the mufflers only, so that I can get a little bit of volume. My IROC is very loud with no muffler, so I can't go straight to an SS that you can't even hear!

 

No, the L98/LT1 sound is much different than the LS1. There was a big thread on LS1.com some time back about this, and the concensus was that the different firing order had a lot to do with and also the different layout of the heads. And yes, the Flowmaster sounds great IMO.

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87 Formula 350 14.81@91.64
98 Z28 1LE 13.15@107.59

 

Do u guys just automatically exclude Edelbrock? I love my catback, and it sounds so nice with the cat gutted. People can hear my car from a block away. Quite on idle and it doesnt crack to much or pop. I would get edelbrock if i were u, its my permanent exhaust on 3rd gens.

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K&N Air Filter 14x3' Open Element, Edelbrock Catback 3", TES Edelbrock Headers, Gutted Cat, 8.8mm Accel Spark Plugs, Underdrive Pulleys, JET Chip (Thurs of this week)
My 88 RS