[-Alero-]

Originally posted by mike2002+May 2 2005, 10:59 PM--><div class='quotetop'>QUOTE(mike2002 @ May 2 2005, 10:59 PM)</div><div class='quotemain'>

i give up, put 2.5" on your car. then you can brag to the kid at checkers you have 2.5" exhaust. you need the 2.25 to maintain decent velocity, the headers are 2.5" for different reasons, and your going to have more exhaust pressure at the headers because of all the exhaust combining/scavanging and whatnot, hence another reason why the headers piping should be a little bigger than the rest of the exhaust. your car is also lightly modded, the s&s is also made to accomadate more heavily modified cars, they arn't going to make 2 series of headers for a low demand car. if you were running cams, heads, intake mani's, tb blah blah, then you'd want 2.5" back

and the aluminum does rust, maybe its from the reaction of the weld, whatever it is, mine rusted through. and it does take years, as in 3, thats how long it took mine to rust through. my aurora was lowered, which helped to speed the process, since it was in more contact with snow/water than if it hadent been lowered i guess.

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uh, trust me aluminum does not rust....i am a welder. it corrodes and the welds can rust yes. but anyways light mods or not, a cat back exhaust is a basic/light mod anyway, but i just dont see why you would go from 2.5 then to 2.25.....makes no sense. im not getting the biggest piping just to brag at checkers. im getting whats best for my car in the future, im pretty confident i will dump more money into the car further down the road, its just maybe taking care of exhaust once and only once is better than redoing it twice.

Originally posted by Spilner521@May 3 2005, 02:22 AM
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@May 2 2005, 03:46 PM
hmmm well, considering i didnt even ask for a definition of what headers do....im gonna still have to ask you.... why would you go from 2.5 in piping (headers) and then downgrade to 2.25 from the cat back?

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yeah i have no idea where headers came into this conversation. going big to small from the engine back? good question. doesnt make much sense to me. if you have 2.5" going into 2.25" towards the back its just going to cause restriction trying to squeeze the amount of exhaust in the bigger pipe down into the small one. restriction is bad.

depending on mods 2.25" is good for small 4 cylinders, 2.25-2.5" for larger 4's and small 6's, and 2.5" for larger 6's. 3400's are decent sized v6 engines. you need room to flow that much exhaust. you'll be happy with 2.5". and trust me, 2.5" piping will do you more good than just being able to brag to 12 year old girls that you have a big exhaust. and if you decide that you do want headers, you'll even gain a little more. like i said before, its all about the little gains here and there that add up.

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yeah going 2.5 isnt gonna hurt. the 2.5 from headers all the way back just seems to make more sense