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Anyone get a rattle after installing new exhaust?

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  • #1

    Anyone get a rattle after installing new exhaust?

    I got the SLP loudmoth on a while back, and for some reason, when the car is cold, the exhaust will rattle at idle, and low RPM's.. This goes away after like 10 mins of driving, but it annoys the hell out of me while it's there.

    Is this a common thing? Sounds like a heatshield vibrating or something.. I haven't jacked it up yet to look, figured if someone else had it they can point me in the right direction.

    Thanks!
    99 SS, MTI Lid, 3.90 gears, Hurst shifter, DMH 3" e-cutout
    Tags: None
  • #2
    same thing here when I got my magnaflow...it rattles too when I accelerate slowly...annoys the crap out of me. but...I learn the live with it cuz I can't anything or feel anything out of place...

    Christopher Teng

    1999 · A4 · 3.73's · Auburn LSD · Whisper Lid · K&N · Pacesetter Headers/Y-pipe
    Magnaflow Cat & Catback · MSD Coils/Wires · Bosch +4 Plugs · EGR Bypass
    B&M SuperCooler · 160* Stat · Descreened MAF · SLP CAI · BMR STB & SFC
    Strano Sways · Eibach Springs · Bilstein HD Shocks · Hawk-Pads · Brembo Blanks
    Speedlines · Nitto 555s · Texas Speed Mail Tune

    Lots of Weight Savings · Stubby Antenna · Corbeau TRS · Zaino · 273K

    F-Body Dirty Dozen

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    • #3
      its probably rumming on the cat heat shield, or its touching some where over the rear axle. its very tight in through there, and it absolutly has to be perfect. jack it up under the rear axle so it still has the weight of the car on it, and look to see if it is touching any where, and also look for any shiney spots. if there are, loosen a clamp or two and gently pry it back away from the shiney area and see if that helps.
      2000 WS6 T/A M6. Monster stage 3 clutch, flowmaster cat back, 4.10's, SLP lid, Hurst shifter.
      1996 Mustang GT 5 speed STOCK DD
      past rides:
      1996 Mustang GTS bright tangerine orange
      2003 Mach 1 azure blue drag car (10.90@118 record holder for fastest N/A mach)
      1969 Mach 1 house of colors candy apple red393 stroker 100 shot (10.829@125 in street trim)
      2003 Mach 1 Torched red FRPP aluminator/vortech 666RWHP
      2008 Mustang GT JDM stroker long block, Saleen 2.3 twin screw
      1980 Mustang L 13.7: 418 stroker
      1994 Z28 A4 rebuilt from wreck
      1994 Z28 A4 totaled

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      • #4
        I never felt the vibration after I put mine on. My buddy's ram did this though, after a couple months. His heat shield on his cat is vibing I think.

        I think a bad cat will make a little noise once it starts going bad. Not sure though.
        97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM

        01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines

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        • #5
          jeffM,
          is your loudmouth welded or just bolted on ?
          mine is welded and i have no problems at all...
          eddie
          1995 Z28 A4, SCC Ultra Z Hood with Air box/K&N filter, Granatelli Maf Sensor/Fernco bellow/Hotchkis STB/white face gauges/LT4 Knock module/March pullies/160* stat without Hypertech Tunning/Borla 3" y-pipe/HI Flo 3" cat/SLP Loudmouth/GM Motive 3.73's + TA rear end girdle/Afs ZR1's silver painted with polished lip 17x9.5 front & 17x11 out back/98 tail light's/BMR SFC's/spohn Lca's/spohn relo brackets & spohn adj. panhard rod " coated mid lenght pacesetters headers + 1.6rr + custom pc tuning going on soon hopefully "

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          • #6
            Check the Y-pipe to I-pipe connection. I had a rattle in mine that I just fixed - I got an exhaust clamp through Jegs - it was about 10 bucks and is far superior to the brackets that came with my kit.
            Silver 02 WS-6, 6 speed, Corsa cat-back, SLP lid, K&N filter, BMR STB, !CAGs, Lou's short stick, MSD wires, MTI "Hammer" cam, ASP underdrive pulley, Hooker LTs, Hooker ORY, Comp 918s, TR pushrods, UMI Sfcs, UMI LCAs, NGK TR55s, Hotchkis springs



            Dyno'd 4/24: 330.9 RWHP/ 344.8 RWTQ (Before cam, headers, and pulley)

            Dyno'd 5/1: 383.5 RWHP / 380.5 RWTQ (393 actual RWHP)

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            • #7
              My exhaust rattle that I was troubleshooting all summer turned out to be the honeycomb thing inside the cat broke loose and rattled when it was cold. Then it rattled even more and I finlly took it off and verified that was the problem and pounded out that bad mo fo with a pipe and now I haven't got a cat inside there. It wasn't for trying to comply, Officer, but the cat gods were against me and I was tired of returning those RANDOM cats for warranty, so mine's hollow now, the exhaust is louder, but that's my story and I'm stickin to it.

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              • #8
                Most of the rattling i saw was from the way it was hung because if those rubber thinds are to loose on the hangers it will vibrate against the sheild easy
                but i dnot have an f-body so i dont know what one looks like underneath
                1986- honda accord lx 2.0 liter fuel injection 5-speed manual 211,000 miles-sold-
                1986- honda accord dx 2.0 liter carb. 4-speed automatic 200,000 miles-sold-
                1992-mitsubishi eclipse 2.0L DOHC 5 speed manual 16" ar rims -blew up- then i sold it- worse mistake ever (buying it)
                1991 hyundai excel-HA! sold
                1995 dodge neon 1.6 liter,5spd, cold air intake, short throw shift, buger bushings, stiffer motor mounts, strut towers/ anti sway, lowering kit, a couple other perf. mods , sleeper

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                • #9
                  Ive had my Loudmouth on for a year and half now and I have not had any kind of rattle at all. The only thing that I expierienced at all is the drone from it. But Ive learned to deal with that.
                  97 SS #C007
                  Polo Green w/ tan leather A4
                  SLP headers, Loudmouth, Koni SA, Spohn LCA, Spohn PHR, Spohn relo brackets, pro-kit, B&M Stage II Shift Kit, air foil, 160 therm, LT4 KM, BFG KDW

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