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  1. #1

    Exhaust On 97' Grand Prix 3800

    I plan on relpacing the original exhaust on my car for something a little throatier sounding. Seeing as my car is only an se it came original with single tip exhaust but i plan on making it a single into dual. Any suggestions as to size of exhaust and what mufflers sound nice on these cars. I plan on running one pipe straight to the muffler/y pipe then running duals out the rear with no cat or other restrictions in the system.

    Input Appreciated,
    Tyson

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    Forum Moderator GP1138's Avatar
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    Re: Exhaust On 97' Grand Prix 3800

    Good luck, it's kind of hard to make those engines sound good.
    John C. Wallace

    1991 Pontiac Grand Prix GTP - LQWIN! - 284 5-speed - Pioneer 9800bt - Keepin' the Early 90's alive!
    1993 Pontiac Grand Prix SE - LHSl0W - 4T60E - Fly Against A Window
    2000 Pontiac Bonneville SSEi - L67 3800 Supercharged - 4T65E-HD - Cruiser

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    pwmin's Avatar
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    Re: Exhaust On 97' Grand Prix 3800

    i'd keep the single for sure. magnaflows can sound good.
    1998 Buick Regal GS

    1987 V10 (SM465/LT1-L31 TBI)
    1990 Grand Am (Duke/Isuzu)

    Former w-bodies - 1996 GTP Special Edition, 1991 GTP 5-speed

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    Re: Exhaust On 97' Grand Prix 3800

    3800's sound like ass with exhaust.

    Factory they flow rather well.

    Get a bigger downpipe, cut your cat, and remove the u-bend, and you'll be good to go.

    Tony.V
    1992 Lumina Z34 |3.4L 207ci DOHC 60 V6; Getrag 284|
    1994 Pontiac Grand Prix GTP |3.4L 207ci DOHC 60 V6; Hydra-Matic 4T60E|
    1999 Chrysler 300M |3.5L 214ci SOHC 60 V6; 42LE|

  5. #5

    Re: Exhaust On 97' Grand Prix 3800

    Quote Originally Posted by 5speedz34
    3800's sound like ass with exhaust.

    Factory they flow rather well.

    Get a bigger downpipe, cut your cat, and remove the u-bend, and you'll be good to go.
    Yeah what he said! It will never sound good no matter what you do to the exhaust, so you might as well just make it flow well and call it a day. Not worth spending your money trying to make it sound good cause it never will.
    99 Grand Prix GT 242,800+ miles<br />9.75:1 L36|K&amp;N|No Cat/Ubend/res|160 tstat|UD ALT|Shift Kit|Powertuner|Ported M90/LIM/TB/Heads|XPZ|Stg 2 IC|Pacesetters|ElecWP|AlumCradle|4340 IS|2.93 15/16&quot; Chain|2750 stall|2.55&quot;. <br />379.9whp on 93 octane, 11.9912 @ 112.99 w/1.729 60&#39;<br />Gen V/N* TB/3.69s since ET.<br />03 CBR 600RR Stock.&nbsp; 11.38 @ 123.64

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    pwmin's Avatar
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    Re: Exhaust On 97' Grand Prix 3800

    thats such bullshit. i had two that sounded good and i have heard numerous others.
    1998 Buick Regal GS

    1987 V10 (SM465/LT1-L31 TBI)
    1990 Grand Am (Duke/Isuzu)

    Former w-bodies - 1996 GTP Special Edition, 1991 GTP 5-speed

  7. #7

    Re: Exhaust On 97' Grand Prix 3800

    3800's sound like ass with exhaust.
    Almost true. The Borla cat-back actually sounds pretty nice and refined and is fairly quiet. MUCH better than some/most/all 3800 exhausts I've seen. It is $$$ though unless you can find a nice used deal. It's also only 2.25in IIRC (mandrel bent with a MUCH better Y-Pipe design though), so for those going pretty radical on an NA buildup (or SC car for tht matter), there are better PERORMANCE options out there.

    Factory they flow rather well.
    Bullshit. Compression bent piping (that necks down to LESS than 2in diameter at some points) and a single (or even dual) muffler designed to keep things quiet.............there is STILL an easy 4-5hp to be had even on an NA car, and I gather some of the louder/larger exhausts on SC cars can net like 6-7hp.

    Get a bigger downpipe, cut your cat, and remove the u-bend, and you'll be good to go.
    The cat itself is barely a restriction and is only hurting a stock NA car a tiny bit. Now the U-bend........that IS a different story. Best way to deal with both is to get a full downpipe. I know Random Technology has one, but it's not the best design in my opinion. *I* would look to have one made, and I KNOW a few different guys on ClubGP do so........look around.





    Either way, don't expect more than 8-10hp even by doing a FULL exhaust on an NA L36 car...........it'll be enough to be "felt", but not enough to make a HUGE difference.

    I'd expect 2-3 tenths in the 1/4 for a full exhaust on an L36 car..........
    1999 Dodge Neon R/T: Is MINE now.........WTF?? Maybe I DO have a working car for autoxing after all!<br /><br />1997 Honda Prelude SH: Still going tap-tap, and still being abused......8000rpm is good for it, I SWEAR.<br /><br />1993 Nissan Sentra SE-R: The parts and organ donor has appeared but has yet to be used.<br /><br />1992 Nissan NX2000: Rusting quietly while I try to figure out if a Bluebird long-block is really worth it.<br /><br />1991 Pontiac Grand Prix: Currently in 4th gear due to a shift-cable malfunction, but I&#39;m so lazy it may NEVER get resurected AGAIN.

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    Euro's Avatar
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    Re: Exhaust On 97' Grand Prix 3800

    Actually the stock 2nd Gen exhaust's flow like shit IIRC. The only part that flows great are the mufflers.

    Just buy a GT/P catback, get the dual exhaust. Then get a 2.5" downpipe, get rid of the u-bend(which the DP will do) and get a higher flowing cat and it'll sound good.
    -Matt
    2000 Regal GS - 160k - GSX grille, 4" K&N, 3" OR D/P, Borla Pro-XS, AL104's - retired before it even got in the game..
    2000 Grand Prix GT - 96k - L26, CAI - SOLD 4/9/11
    1994 Lumina Euro - 127k - Z34 grille, Monte Z34 16's, odds 'n' ends, Super Chevy award winner - SOLD 4/18/07

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    Re: Exhaust On 97' Grand Prix 3800

    How do we know he even has a U-bend? Mine came stock without one and its a 99 with the 3800 II. Trust me, I looked, it's not there.


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    Re: Exhaust On 97' Grand Prix 3800

    my friends 98 SE 3800 had a u-bend. single sounds better and looks better IMO. both my exhausts on the riv were single w/ magnaflows and sounded great. not raspy at all and loud.

    Quote Originally Posted by Euro
    Actually the stock 2nd Gen exhaust's flow like shit IIRC. The only part that flows great are the mufflers.

    Just buy a GT/P catback, get the dual exhaust. Then get a 2.5" downpipe, get rid of the u-bend(which the DP will do) and get a higher flowing cat and it'll sound good.
    thats what i heard, too.
    1998 Buick Regal GS

    1987 V10 (SM465/LT1-L31 TBI)
    1990 Grand Am (Duke/Isuzu)

    Former w-bodies - 1996 GTP Special Edition, 1991 GTP 5-speed

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    Re: Exhaust On 97' Grand Prix 3800

    Quote Originally Posted by DRGrocho
    How do we know he even has a U-bend? Mine came stock without one and its a 99 with the 3800 II. Trust me, I looked, it's not there.

    Every 2nd Gen had a u-bend. Someone must've replaced it before you bought it. The 3rd Gen GP's didn't have the u-bend.
    -Matt
    2000 Regal GS - 160k - GSX grille, 4" K&N, 3" OR D/P, Borla Pro-XS, AL104's - retired before it even got in the game..
    2000 Grand Prix GT - 96k - L26, CAI - SOLD 4/9/11
    1994 Lumina Euro - 127k - Z34 grille, Monte Z34 16's, odds 'n' ends, Super Chevy award winner - SOLD 4/18/07

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    Re: Exhaust On 97' Grand Prix 3800

    Ok, well everything I've heard is that the mufflers flow rather well, and that getting rid of the U-bend, cat, and getting a bigger downpipe is pretty good performance wise.

    There is a reason most of the Michigan guys don't run aftermarket exhaust, 3800's sound like ass.

    EDIT: I guess what I'm getting at is you don't need to change the whole exhaust to get some decent performance out of it.


    Tony.V
    1992 Lumina Z34 |3.4L 207ci DOHC 60 V6; Getrag 284|
    1994 Pontiac Grand Prix GTP |3.4L 207ci DOHC 60 V6; Hydra-Matic 4T60E|
    1999 Chrysler 300M |3.5L 214ci SOHC 60 V6; 42LE|

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    Re: Exhaust On 97' Grand Prix 3800

    3800'd sound great at idle, its when you rev them is when they sound like poo(raspy), regardless of any cat back that i have heard. this is why i recently ordered a Vibrant resonator, in hopes of supressing that rasp.

    a downpipe should be the first investment. hogan(like i have), random technologies, ZZP.... they all offer one that removes the u-bend and has a high flo cat.

    and get a dual exhaust off a GT or GTP.
    00 GTP - mine | 05 Mariner - hers | 95 F150 - ours?

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    Re: Exhaust On 97' Grand Prix 3800

    Quote Originally Posted by 5speedz34
    3800's sound like ass with exhaust.

    Factory they flow rather well.

    Get a bigger downpipe, cut your cat, and remove the u-bend, and you'll be good to go.
    That's what I have done except my resontor is also gone. It has to be one of the worst sounding exhausts ever haha. I'm sure a set of magnaflows or a nice glasspack would make it sound alot better.
    2008 Pontiac G8 GT - Roto-fab Intake, Superchips Cortex tune, Solo Axle-back Exhaust

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    pwmin's Avatar
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    Re: Exhaust On 97' Grand Prix 3800

    i wish someone on here wouldve heard my exhaust on the riv.


    DO NOT PUT ON DUAL EXHAUST!!!! how many times do i have to say it?
    1998 Buick Regal GS

    1987 V10 (SM465/LT1-L31 TBI)
    1990 Grand Am (Duke/Isuzu)

    Former w-bodies - 1996 GTP Special Edition, 1991 GTP 5-speed

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