Cat back exhaust question.

2280 Views 24 Replies 7 Participants Last post by Marvin, Jan 21, 2005

Maxwell31

Discussion Starter · Jan 16, 2005

Hi all, have a problem and hope I can get some help.

I want to get a Cat-back exhaust but don't know which one to pick up.

They have ones from Greedy, Nismo (a tad on the expensive side), Magnaflow, Vibrant (Duel tipped, three inch outlets, not bad, looks stock from afar).

Anybody have any suggestions which would give me the most gains? I am kind of pushing towards Magnaflow but still am undecided.

Any help would be great and thanks in advance!

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Zac

· #21 · Jan 20, 2005

caveman said:
Common NickZak, you can't say 2.5" is best for any 4cyl. I've personly seen low end loss from larger exhaust. My brother n law installed a larger exhaust on a escort GT. I drove it afterwards and it bogged for a bit before it started to pick up. I got a little bit of low end loss on my turbo car with a full 2.5". The loss is so short and the overall gain is much more, that it doesn't matter, but the loss is so short because the turbo spools. It would be longer if it were NA.

I'm not saying that a larger exhaust is never the right choice, because it can be. I wasn't suggesting that you don't get a larger exhaust or telling you how to tune your car. However, like you said yourself, you gotta be working on a real build up. Not every spec V owner on this list is going to be doing major build ups. Most of them will probably be doing bolt on mods. They are worth doing too. They free up some HP and raise the MPG. I was just suggesting that the cost to HP ratio would probably be better to get a K&N drop in, header with no cat, high flow main cat, and muffler for a bolt on build up only. If you arn't going to touch the engine, then what's the point on going with a larger exhaust size? I would personly spend the rest of the money on other things cause for bolt ons only, the extra few possible HP is gonna cost hundreds. You could save it for new tires cause everyone is bitching about the stockers. That and the stereo. Or hell, buy your date something.

Last but not least, if your build up and car cost get close to the cost of a srt-4, then um, you must really love Nissan.

To answer the original question, I really like magnaflow for a 4cyl car. They look and sound great and they last.

Without a dyno sheet, I cant say how much if any low end is lost. I will on our engine trade some low end for more mid and top for what I am looking for. And considering I got the car 13.9 new, I got a little leeway until my pocketbook meets up with an SRT.

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Zac

· #22 · Jan 20, 2005

Mark said:
Ok, i'm going to just skip over the subject of diameter and ask a good one.....

Is there a huge gain differnece between a custom job and buying a prefabbed one (except for mandrel bends)?

I can't see there being a huge difference.

Do you mean like a name brand vs custom piping? Crush vs Mandrel?

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Marvin

· #23 · Jan 20, 2005

I mean I ordered my resonator and muffler off of the web, took it to my local muffler shop (who has done work for me and a fellow 3rd Gen) and he put in custom, non mandrel bent pipe. It goes straight back to the muffler, a very slight bend, but no where to bog down at all.

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Zac

· #24 · Jan 20, 2005

Mark said:
I mean I ordered my resonator and muffler off of the web, took it to my local muffler shop (who has done work for me and a fellow 3rd Gen) and he put in custom, non mandrel bent pipe. It goes straight back to the muffler, a very slight bend, but no where to bog down at all.

I doubt their is a huge difference but mandrel bent is generally better than crush bent. The only way to tell is on a dyno. IIRC you have a header so I am going to guess your car is VERY loud, even with the resonator.

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Marvin

· #25 · Jan 21, 2005

NickZac said:
I doubt their is a huge difference but mandrel bent is generally better than crush bent. The only way to tell is on a dyno. IIRC you have a header so I am going to guess your car is VERY loud, even with the resonator.

Loud as hell. Doesn't bother me in the cabin, but I hate how it sounds outside the car. But thats neither here nor there. I'd love to quiet it down, but I dont think dynomat works in exhaust pipes.

I could see where mandrel bends would work with a few curves and zig zags, but mine doesn't have any....

As you can see, the one turn that it does have isn't very severe.

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Cat back exhaust question.

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