I have tried searching for something similar to my current problem but had no success. I just recently put on Greddy headers, magnaflow universal 91000 cat, greddy sp2 exhaust. when i accelerate quickly coming from the rear it sounds like a vibrating/rattling noise mixed with a small tumbling noise. I ordered the copper gaskets from summit because i kept blowing the gaskets from autozone. I am confused being that all the parts are new except the headers. I have no clue as to what can be causing htis problem. Any input would be helpful. Thanks

-Steven

1999 Eclipse GS 10th Anniv, Greddy Headers, Greddy Sp2 Exhaust, AEM CAI, Nology Hotwires, Streetglow Undercar Kit, Intrax Springs

First, you only have one header. Not multiple ones.

Have you gotten under the car to see if any heat shielding is vibrating on the exhaust? That would be my first guess.

98 Eclipse GS Turbo
Built motor - MS2 - Holset hy35 - Zoom Stg 4 Clutch - 57.5mm TB - ARP Headstuds - Turbonetics wastegate - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - 650cc Injectors - Fidanza Flywheel - Cobra calipers w/ 13" Rotors - Oil Cooler - DevilsOwn meth injection

1981 Chevy Scottsdale
1987 Nissan 300zx - Chump Car
2001 BMW 325i

My exhaust rattling is from my piping tapping on my frame in the back end. That might be another place to check

-Ben
Black 1999 RS

Basic mods and a South Bend OFE-SS Clutch
~150bhp.....for now!

Thanks Ill get under the car later today.

1999 Eclipse GS 10th Anniv, Greddy Headers, Greddy Sp2 Exhaust, AEM CAI, Nology Hotwires, Streetglow Undercar Kit, Intrax Springs

I get some rattle from the hanger next to the J-bend near the rear of the car. Might look there, or like it was said before, check the heat shielding.

1998 Eclipse RS-T - Totaled 4/23/09 -
1998 Eclipse GST - Stroked 2.3l, HX40 fed: Build in progress
2010 Subaru Outback Limited

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Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

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