96 deville N* cats question
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Northstar Engines and System Technical Discussion Discussion, 96 deville N* cats question in Cadillac Engine Technical Discussion; i got a 96 deville wit the northstar and it has factory dual exhaust on it, i am going to ...
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    hogstamogsta's Avatar
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    Exclamation 96 deville N* cats question

    i got a 96 deville wit the northstar and it has factory dual exhaust on it, i am going to put magnaflows or flowmasters or something on it within the next few weeks, i was wondering should i take the cats off or can i not because of the back pressure and what not? would it be louder if i took them off and better performance or what should i do..any suggestions please help

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    Re: 96 deville N* cats question

    I have flowmaster delta flow 40seris and i love them. i would leave the stock cat but remove the resantor. i still have my resantor but will be taking it off soon. its not duals just 2 mufflers.

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    fubar569 is offline Cadillac Owners Fanatic
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    Re: 96 deville N* cats question

    what you need is this

    full custom bent 3" from as far up as your shop can go...no resonator, into flowmaster delta flow race mufflers (3"). this will make your car sound like none other on this planet. it will be loud. for more mellow go flowmaster 2 chamber...i plan on eliminationg my cat and getting MIL eliminator to fool the ECM.

    so mine will be full 3", no cat and no resonator, 1 chamber flows. get ready to feel the thunder.

    also, if i can get header flanges and a tubing kit, you may see one of the few devilles with custom long tube headers. imagine those on perhaps a true dual 2.5" system. simply badass.

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    Re: 96 deville N* cats question

    yeah i plan on doing that, i just didnt know if it would run shitty without the cat cuz no matter what im takin the resenator off anyways...

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    Re: 96 deville N* cats question

    Whatever you do don't go that damn high -- 3" man. Get 2.5", anything over that and you will lose mad torque and these motors are gutless from the bottom anyway, why would you want to make it even worse.

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    fubar569 is offline Cadillac Owners Fanatic
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    Re: 96 deville N* cats question

    then corsa must be doing something wrong because their exhaust is a full 3" system. many people use it and report awesome gains, not to mention sound.

    a single 2.5" is a restriction to these cars. my mustang was dual 2.5" and it was same displacement (4.6L) but only a 2v motor. i could've gone 3" very easily with what i planned on doing to it.

    agreed some backpressure must be retained, but on a motor like this, a single 2.5" would be a worthless move, especially since the stock system is a 2.5" system on most northstar vehicles.

    now with me wanting to do headers, a dual 2.5" would be more appropriate.

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    Re: 96 deville N* cats question

    ok well im just gonna take the cats off then n go all out

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    chevelle is offline Cadillac Owners Enthusiast
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    Re: 96 deville N* cats question

    Putting 3 inch exhaust piping on is NOT going to cause any loss of torque. The "lack of backpressure causing torque loss" is a ricer fairy tale. BS.

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    Re: 96 deville N* cats question

    should i do 2 mufflers or 1?

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    fubar569 is offline Cadillac Owners Fanatic
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    Re: 96 deville N* cats question

    it is possible to lose power by gong with too large of an exhaust, but with these motors this is just not the case. they like to breathe, we just don't have the room to run a proper exhaust...

    I'd do 2 just to keep the looks of stock. some nice polished tips will look good. not to mention single outlet exhaust on a V8 = teh gheyness

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    Re: 96 deville N* cats question

    Quote Originally Posted by hogstamogsta
    should i do 2 mufflers or 1?
    2... the car came with 2 so 1 would look stupid IMO.

    And chambered mufflers (flowmasters fall into this category) suck. Well they sound good but are more of a restriction.

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    Re: 96 deville N* cats question

    How about dynomax?? what the hell would you recommend for power and sound? I hope not corsa. i Dont like the exotic sound they have, it just doesnt sound right on this V8.

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    Re: 96 deville N* cats question

    i love my flowmasters! i gain so seat power you know but not sure how much.

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    Re: 96 deville N* cats question

    Quote Originally Posted by auroradude
    How about dynomax?? what the hell would you recommend for power and sound? I hope not corsa. i Dont like the exotic sound they have, it just doesnt sound right on this V8.
    Exotic? What the hell are you talking about?

    Removing the cats is great if you never plan on getting your car inspected again, seeing as how it will almost certainly fail. Headers are pretty much useless on these cars since the factory manifolds are not very restrictive. Ask Mark, he said that he asked about getting the stock manifolds extrude honed and was told that they didn't really need it, seeing as how they already flow pretty damn good.

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    Re: 96 deville N* cats question

    Quote Originally Posted by danbuc
    Exotic? What the hell are you talking about?

    Removing the cats is great if you never plan on getting your car inspected again, seeing as how it will almost certainly fail. Headers are pretty much useless on these cars since the factory manifolds are not very restrictive. Ask Mark, he said that he asked about getting the stock manifolds extrude honed and was told that they didn't really need it, seeing as how they already flow pretty damn good.
    the tech section says that the stock manifolds are pretty restrictive. or is it just the cross pipe?

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