if your more serious about gains go for 2.5 inch piping. i like the stromung best for sound. i have a 2.5 inch vrs with magnaflow muffer and i am very happy with the split between cost, sound and performance.
VRS sells the 2.5 for $320...I got mine a good bit less from Stemar Motorsports though.Maxwell31 said:How much did that set-up cost you and thanks for the input!
No. If anything, 2.25 is too small. When tested on a 2.4 liter engine, the 2.5 yielded much higher gains than the 2.25. Especially if you are building your engine, 2.5 is a must. If you are turbocharging, then you should go 3.2.5sentra03 said:wow 2.5? isnt that a lil too big? i thought 2.25 would be perfect.
2.4 liter Cavileer and gains were about 4 WHP difference. I'll see if I can find the dyno sheets. I dont know any DSM guys running 11s with a 2.5 inch exhaust. My buddy was running around 400WHP and he was 3 inch piping all the way. DSMs need to get rid of back pressure. Some Supras run 5 inch piping. We do not lose low end on a 2.5 inch piping IIRC. The Magnaflow is 2.25, the VRS I was referring to with the Magnaflow muffler is whatever size you choose.caveman said:Who tested this? I ask because on a DSM, a 2.5" exhaust is good for 11s 1/4s. 3" is going to be overkill on a 4cyl street aplication turbo or not. A lot of people do it, but it isn't really needed. It is generally only needed for track use and large turbo's. The larger the exhaust, the more low end you will loose.
I just can't see a na 2.5l needing all that exhaust. I think it would be interesting to see a dyno with the stock exhaust compared to the stock exhaust with a high flow cat and streight through magnaflow muffler. The stock muffler looks like a huge truck muffler. Anyone see a cutout? I bet the exhaust is bounced back 3 times before it exits the muffler.
I suppose I worded that poorly and should have said cars in general.caveman said:No one could have been working on DSMs for 3 decades. They are only 15 years old.
I'm going to bed.
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.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.
Do you mean like a name brand vs custom piping? Crush vs Mandrel?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.
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.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.