Annoying Resonance with Stromung cat-back....

milano6 · 02-10-04, 03:27 AM

Hey guys, I had the Stromung cat-back exhaust installed about a month ago at a local shop. Because the bolts were toast where the b-pipe meets the cat and because I didn't receive enough gaskets from Stromung, the guys at the shop decided to weld the b-pipe to the cat. Everything was fine for the first couple of weeks, but now I have a VERY annoying resonance at about 2900-3k RPM's. The resonance seems to occur mostly when the engine is under load. It really sounds like sh*t and I don't think I can keep driving it as is. Do any other Stromung cat-back owners have this resonance? Might it be specific to the 6-speed? Or is it possible the shop did a poor job on the install?

Any help/advice is greatly appreciated.

RangerJoe · 02-10-04, 03:38 AM

check all of the heat shield bolts. when i did my exhaust, i had one around there, and it turns out one of the bolts wasnt tightened down.

also check for leaks. try and get your car on a lift, and with the car running, pour some water over the meeting between the b pipe and the cat and see if there are any bubbles from a leak...

it could just be your Stromung is 'broken in' now. when i got my remus, it was quite a bit quieter than it is now. after a month or so of driving, there was a noticeable difference in tone and loudness.....

**Mike Diaz** · 02-10-04, 03:38 AM

I would check the install, it's a possibility that they didn't weld it very good and you could have a pin hole or a leak. I would get it checked out. What does it sound like? Tin cans rattling?

milano6 · 02-10-04, 03:52 AM

Quote:

Originally posted by Mike Diaz
I would check the install, it's a possibility that they didn't weld it very good and you could have a pin hole or a leak. I would get it checked out. What does it sound like? Tin cans rattling?

Thanks for the replies fellas.

Yes, it does sound like tin cans rattling....but at a very fast rate. It's to the point where I shift at 2500 RPM's just to avoid it. I to suspect a poor install, but I thought I'd ask here first to see if others have had it.

91LSMAN · 02-10-04, 11:33 AM

Quote:

Originally posted by milano6
Thanks for the replies fellas.

Yes, it does sound like tin cans rattling....but at a very fast rate. It's to the point where I shift at 2500 RPM's just to avoid it. I to suspect a poor install, but I thought I'd ask here first to see if others have had it.

I had rattling when my Greddy was first installed. My mechanic and I had my Legend on a lift and saw that because the brackets on the Greddy were slightly larger one of them was hitting a piece of the heat shield, near the cat. He bent it with his hand and it's been more than a year and I've had no problems.

llloydxmas · 02-11-04, 07:28 AM

My car had the same problem for a long time. Once I got it up on the lift I found that one of the heat shield bolts was loose. All I had to do is bang the exhaust pipe and heat shield a few times with my hand to hear the sound get reproduced - then I just followed the sound to the trouble spot.

milano6 · 02-13-04, 04:18 AM

Problem resolved! It ended up being a loose heat shield after all. I thought the shop that installed my exhaust had removed them, but apparently not.

All is well now.

91LSMAN · 02-13-04, 12:07 PM

Quote:

Originally posted by milano6
Problem resolved! It ended up being a loose heat shield after all. I thought the shop that installed my exhaust had removed them, but apparently not. All is well now.

I thought so. Glad to hear it!!

Chauffeur First · 02-14-04, 09:40 PM

good to hear you got that resolved, that EXHAUST IS SICK, ever since I heard and rode in takemorepills car, I was like wow.....

Jason

BTW..Your car is lookin mighty clean

02-10-04, 03:27 AM	#1 (permalink)
milano6 Legend > * Join Date: Jan 2003 Location: Federal Way, WA Posts: 283 Car 1: 03 CL Type-S 6MT iTrader: (0)	Annoying Resonance with Stromung cat-back.... Hey guys, I had the Stromung cat-back exhaust installed about a month ago at a local shop. Because the bolts were toast where the b-pipe meets the cat and because I didn't receive enough gaskets from Stromung, the guys at the shop decided to weld the b-pipe to the cat. Everything was fine for the first couple of weeks, but now I have a VERY annoying resonance at about 2900-3k RPM's. The resonance seems to occur mostly when the engine is under load. It really sounds like sh*t and I don't think I can keep driving it as is. Do any other Stromung cat-back owners have this resonance? Might it be specific to the 6-speed? Or is it possible the shop did a poor job on the install? Any help/advice is greatly appreciated. __________________ 1994 Legend LS Coupe 6MT (Sold) 2003 CLS 6-speed Anthracite/Ebony - H&R Sport Springs - Debadged - 14.68@95

02-10-04, 03:38 AM	#3 (permalink)
Mike Diaz WHAAAAAH! Join Date: Jan 2002 Location: N Canton, Ohio Posts: 10,987 Car 1: 3.5L 1991 LS Coupe 5 Spd Blk/Blk Car 2: 1994 Civic EG Hatch Car 3: 03 Honda TRX400EX iTrader: (2)	I would check the install, it's a possibility that they didn't weld it very good and you could have a pin hole or a leak. I would get it checked out. What does it sound like? Tin cans rattling? __________________ 2nd Gen FAQ \| Newbie FAQ \| Bleeding Coolant DIY \| Manual Trans Flush DIY 3.5L DIY \| Crank-No Start Diagnosis \| How I built My Legend

02-11-04, 07:28 AM	#6 (permalink)
llloydxmas Completly rebuilding... Join Date: Apr 2002 Location: Reno/Tahoe Posts: 230 Car 1: '94 LS 6-Spd Coupe iTrader: (1)	My car had the same problem for a long time. Once I got it up on the lift I found that one of the heat shield bolts was loose. All I had to do is bang the exhaust pipe and heat shield a few times with my hand to hear the sound get reproduced - then I just followed the sound to the trouble spot. __________________ http://www.imagestation.com/picture/...d/fae2e002.jpg 1994 ACURA LEGEND LS COUPE 17" Konig Tantrums Momo Shift knob & E-brake InSaneAnime Grounding Kit "RED" Eibach Pro-Kit Koni REDS Rerverse Indiglo Gauges Valentine One w/conceal display Pioneer 8500MP deck Rockford-Phosgate speakers XM-system Moonroof Tilt-mod MLS strut bar

02-13-04, 04:18 AM	#7 (permalink)
milano6 Legend > * Join Date: Jan 2003 Location: Federal Way, WA Posts: 283 Car 1: 03 CL Type-S 6MT iTrader: (0)	Problem resolved! It ended up being a loose heat shield after all. I thought the shop that installed my exhaust had removed them, but apparently not. All is well now. __________________ 1994 Legend LS Coupe 6MT (Sold) 2003 CLS 6-speed Anthracite/Ebony - H&R Sport Springs - Debadged - 14.68@95

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02-10-04, 03:38 AM	#2 (permalink)
RangerJoe werd..... Join Date: Apr 2003 Location: Stillwater, Oklahoma Posts: 6,220 Car 1: 92 LS coupe 5spd iTrader: (4)	check all of the heat shield bolts. when i did my exhaust, i had one around there, and it turns out one of the bolts wasnt tightened down. also check for leaks. try and get your car on a lift, and with the car running, pour some water over the meeting between the b pipe and the cat and see if there are any bubbles from a leak... it could just be your Stromung is 'broken in' now. when i got my remus, it was quite a bit quieter than it is now. after a month or so of driving, there was a noticeable difference in tone and loudness.....

02-14-04, 09:40 PM	#9 (permalink)
Chauffeur First JROO Join Date: Nov 2002 Location: Oregon Posts: 2,329 Car 1: 1991 Legend 4dr LS, 2001 Jetta vr6 GLX 5 speed, 2002 Lexus IS 300 5 speed, 2003 Infiniti M45 iTrader: (1)	good to hear you got that resolved, that EXHAUST IS SICK, ever since I heard and rode in takemorepills car, I was like wow..... Jason BTW..Your car is lookin mighty clean

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