Originally Posted by Yamaha Dave
Sure sounds like it here buddy.
The cost of piping as far as materials is cheap, you're right about that. It's the time and labor the shop charges to cut, bend, fit, and weld the piping into place that makes it expensive which is the reason most people don't do it.
Why not? He already said himself he's going to replace the whole thing because of rust so why not get the added benefits of stepping up to a 2.5? You don't need FAI to benefit from having a more free flowing, less restrictive exhaust system. He's only going up .25 of an inch. It's not like he's throwing a 3.5" exhaust running a straight pipe...
So what you are trying to to tell me is that by going .25 of an inch in diameter in the exhaust tubing is all of the sudden going to loose torque and HP??? Sorry you're wrong there. Once again .25 of an inch is negligible the 3.4l responds very well to the increase in size and going to a 2.5 tubing will increase the volume in the exhaust system and higher flow capacity. A 3" exhaust would definately be overkill and running this size or anything above it would most certainly have some negative effects. The point is to find the perfect balance in which this case is a 2.5" exhaust. The stock exhaust is somewhat restrictive and 3" is not restrictive enough. The purpose of the exhaust is to get the exhaust gases out as fast as possible with the least restriction possible. Some restriction is needed to keep the gases hot enough to pass through the system, but .25 of an inch doesn't open it up enough to slow the exhaust gases to a point of cooling where the velocity slows down and the gases don't get spent. All in all you're going to continue to believe whatever you want. I'm out, it was fun but I have an exam to study for.
1) I told him what happened to my truck. And mine has only stalled out like less then 10 times in the last 6 months. Its not any less reliable. Can't you read?
2)Idk what exhaust shop your going to..but your getting ripped off if i can get it that cheap in the middle of no where and you can't..
circumference of 2.25=7.065
Area of 2.25= 3.97
area of 2.5=4.91
so lets say the pipe for the headers is...idk..6 feet..or 72''...
volume of 2.25=285.84
volume of 2.5= 353.52
so a 2.5'' pipe flows 67.68 cu in more..way to much..
Thats a big difference man..and it is not worth it. Yes he should still get new pipe, but not 2.5'' to keep the power on the low end good, he should stay a 2.25.
And for the last time. I did plenty of looking into this on this site and others, 2.25 is the best pipe to run as your main pipe to keep the 3.4l happy. Do some research and you'll see.
Ill leave the OP to decide what he wants. Its his truck and he can do what he wants. And i don't care what you say man, i know what i know and i highly disagree with you. But I'm not going to try and convince you anymore.
Originally Posted by Texasdynaryder
Well in that case, I guess the same douchebag that built my engine assembled Montes as well. I did gain a bit of high rpm power and maybe mpg while on the interstate but around town it plummeted. Im not into rocket science but I can add and subtract miles on tank of fuel to get mpgs. And I did lose lower end power the minute after my install, as most other have also. Not to mention that im only 265/70s on the hoof unlike his 33x 12.5s.
Yep exactly. Even with my 31s my motor from idle to 2k lost a lot. After 2k its fine and i did see mpg improvements on the highway. But damn it killed it on city which is what most of us do anyways. of course now the 33s don't help
but no way in hell am i going back to 31s haha