New exhaust - what to buy? - Page 2 - ZR-1 Net Registry Forums

Norwegianmopar · 08-03-2018

Hi Roy,

The dual mass flywheel will rattle if the engine is running rough. Does the car accelerate smoothly at low engine speeds below 3000 rpm? It should accelerate slowly but smoothly if you open the throttle 100% at 3000 rpm in fourth gear. Let me know what happens when you perform that test.

Marc

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Norwegianmopar · 08-03-2018

Maybe it's not the cats after all...maybe the exhaust leak and the engine running rough that produces that rattling sound. Dropping by a garage over here to have them check it out. Still have over 500 miles home from our roadtrip.

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WARP TEN · 08-03-2018

I would certainly second the idea of Stainless Works headers, high flow cats and a Corsa cat back. But I also really liked my last approach on my '95 to utilize the stock '95 cat back system (behind SW headers and no cats) with electric cutouts just ahead of the rear mufflers. the center resonator on late model systems is pretty free flowing, and the cutouts give you the best of both worlds--quiet when you want it and wide open at other times. Marc Haibeck didi the excellent work on this and I fashioned my own under the carpet rocker switch. There are posts elsewhere on this.--Bob

Bob Eyres · 08-09-2018

You didn't say if Cats were required by law where you live. If not, the most free flowing system is headers, 3"X pipe, no resonator, 3" exhaust pipes and 3" mufflers of your choice. The sound of this system is a low rumble at idle, and very loud at high rpm. With lots of resonance, (many people find this offensive).

Corsa is very good at eliminating resonance, but has a high pitched shriek at full throttle high rpm. Some like this, some don't.

How you want it to sound is really a subjective matter of taste.

Norwegianmopar · 08-10-2018

I must have cats over here. Any experience with X-pipe instead of the mid muffler..?

Would you recommend Dynamat or similar if headers are installed?

Found out my cats are intact, it was probably the DM flywheel making the noice due to the car running a bit rough at the time.

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S.hafsmo · 08-10-2018

Wouldn't recommend anything that would cause drone, at least not if you're going to use the car for such journeys you've just been on. My car came with mid muffler removed, and replaced with a rather poor x-pipe. Horrible drone at all cruising speeds.

I've got the Corsa now, no drone, and the volume is just within what I can withstand for longer periods.

Karl · 08-10-2018

For headers go with the OBX. Best value out there.

Norwegianmopar · 08-17-2018

Have decided to get a x-pipe and will keep the Borla mufflers back rear and the stock manifolds for now. What and where to buy?

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rkreigh · 08-21-2018

won't work my friend. the cats are welded up on those manifolds

drop the exh and take a scope and a light and you can see if the cats have given up If there is a hole in any of the cells and they are falling apart un bolt them. They can't reasonably be fixed.

Car needs headers anyway.

Norwegianmopar · 08-21-2018

Quote:

Originally Posted by rkreigh

won't work my friend. the cats are welded up on those manifolds

drop the exh and take a scope and a light and you can see if the cats have given up If there is a hole in any of the cells and they are falling apart un bolt them. They can't reasonably be fixed.

Car needs headers anyway.

The cats are ok. It's only the mid resonator that needs replacing. It's Flowmaster behind the cats.

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08-03-2018	#11
Norwegianmopar Join Date: Mar 2018 Location: Norway Posts: 345	Re: New exhaust - what to buy? Hi Roy, The dual mass flywheel will rattle if the engine is running rough. Does the car accelerate smoothly at low engine speeds below 3000 rpm? It should accelerate slowly but smoothly if you open the throttle 100% at 3000 rpm in fourth gear. Let me know what happens when you perform that test. Marc Sent from my SM-G955F using ZR-1 Net Registry mobile app __________________ Roy Martin 1994 ZR-1 #112 Admiral Blue/Black Dana 4:10 Aluminum flywheel Corsa exhaust Watson headers Haibeck chip 470 HP/399 RWHP 1991 ZR-1 #400 White/Red (SOLD) Dana 4:10 Powder coated engine Haibeck performance chip Borla exhaust

08-03-2018	#12
Norwegianmopar Join Date: Mar 2018 Location: Norway Posts: 345	Re: New exhaust - what to buy? Maybe it's not the cats after all...maybe the exhaust leak and the engine running rough that produces that rattling sound. Dropping by a garage over here to have them check it out. Still have over 500 miles home from our roadtrip. Sent from my SM-G955F using ZR-1 Net Registry mobile app __________________ Roy Martin 1994 ZR-1 #112 Admiral Blue/Black Dana 4:10 Aluminum flywheel Corsa exhaust Watson headers Haibeck chip 470 HP/399 RWHP 1991 ZR-1 #400 White/Red (SOLD) Dana 4:10 Powder coated engine Haibeck performance chip Borla exhaust

08-09-2018	#14
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	Re: New exhaust - what to buy? You didn't say if Cats were required by law where you live. If not, the most free flowing system is headers, 3"X pipe, no resonator, 3" exhaust pipes and 3" mufflers of your choice. The sound of this system is a low rumble at idle, and very loud at high rpm. With lots of resonance, (many people find this offensive). Corsa is very good at eliminating resonance, but has a high pitched shriek at full throttle high rpm. Some like this, some don't. How you want it to sound is really a subjective matter of taste. __________________ "It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft.

08-10-2018	#15
Norwegianmopar Join Date: Mar 2018 Location: Norway Posts: 345	Re: New exhaust - what to buy? I must have cats over here. Any experience with X-pipe instead of the mid muffler..? Would you recommend Dynamat or similar if headers are installed? Found out my cats are intact, it was probably the DM flywheel making the noice due to the car running a bit rough at the time. Sent from my SM-G955F using ZR-1 Net Registry mobile app __________________ Roy Martin 1994 ZR-1 #112 Admiral Blue/Black Dana 4:10 Aluminum flywheel Corsa exhaust Watson headers Haibeck chip 470 HP/399 RWHP 1991 ZR-1 #400 White/Red (SOLD) Dana 4:10 Powder coated engine Haibeck performance chip Borla exhaust

08-10-2018	#16
S.hafsmo Join Date: Nov 2016 Location: Norway Posts: 397	Re: New exhaust - what to buy? Wouldn't recommend anything that would cause drone, at least not if you're going to use the car for such journeys you've just been on. My car came with mid muffler removed, and replaced with a rather poor x-pipe. Horrible drone at all cruising speeds. I've got the Corsa now, no drone, and the volume is just within what I can withstand for longer periods. __________________ - '90 ZR-1

08-10-2018	#17
Karl Join Date: May 2013 Location: Chicago Posts: 980	Re: New exhaust - what to buy? For headers go with the OBX. Best value out there. __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold

08-17-2018	#18
Norwegianmopar Join Date: Mar 2018 Location: Norway Posts: 345	Re: New exhaust - what to buy? Have decided to get a x-pipe and will keep the Borla mufflers back rear and the stock manifolds for now. What and where to buy? Sent from my SM-G955F using ZR-1 Net Registry mobile app __________________ Roy Martin 1994 ZR-1 #112 Admiral Blue/Black Dana 4:10 Aluminum flywheel Corsa exhaust Watson headers Haibeck chip 470 HP/399 RWHP 1991 ZR-1 #400 White/Red (SOLD) Dana 4:10 Powder coated engine Haibeck performance chip Borla exhaust

08-21-2018	#19
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: New exhaust - what to buy? won't work my friend. the cats are welded up on those manifolds drop the exh and take a scope and a light and you can see if the cats have given up If there is a hole in any of the cells and they are falling apart un bolt them. They can't reasonably be fixed. Car needs headers anyway. __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)