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Discussion Starter #1
i couldn't really find any thing on it. i was just wondering what size exhaust and header and which brand would you all suggest to get for the most hp and mpg gains. any help would be great.
 

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don't get a new header unless yours is cracked.

by exhaust do you mean cat back or muffler? 2.25" is stock pipe and i run the flowmaster 40 and love it.
 

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don't get a new header unless yours is cracked.

by exhaust do you mean cat back or muffler? 2.25" is stock pipe and i run the flowmaster 40 and love it.
i was thinking about getting a cat back.
 

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03Wrangler i completely disagree. That is preatty crappy stuff here the peak is what you want. I dont think you will need top end hp on your engine if you are only using it for lows. Something this faq does is it only says whats best for average. I do agree with the faq though it moves power from low to high or high to low rpm but does not create difference in average hp.

I gues why i completely disagree with the stuff in the "lessons" is if you need a low end torque you can get bunch of stuff that help out with low end. Although it wont increase your average hp and tq it will definetly help you with lows and that is what you are using.

Let take F1 racing for example. Those engines rev up to 18k rpm. How many people do you think drive them in the 2-3k rpm range? Thats exactly my point there is no power there. They tune them up for what they need so they take the hp from the lows to transfer it to the high. Let say you have 1 of those formula cars tuned to be in the low end for torque and the peak is 800hp at 5K rpm and let say there is another formula car that is tuned for 800 hp at 14k rpm. Those cars will behave totally different because the peaks (which is the "false god of "peak"" according to the article) Those 2 cars will get totally different times.

another example:
Let say you have a truck engine which produces 600 hp peak at 3500 rpm and is really flat curved. and let say it has average of that engine is 550 hp. Now compare that to some thing else made for racing that has a peak of 850 hp at 7k rpm with really bad low end so its average is only 500 hp. Although the truck has much better average the max hp you can get out of that engine is 600 hp while you can get 850 hp out of the racing engine. I know you are probably thinking well still though what if you fall in rpm for that racing engine.. i gotta tell you let the transmission do its job.
 

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no reason to put a bigger pipe unless you have a blower on it.
as far as back pressure and losing torque thats a myth.
A myth? Well, I installed a flowmaster 40 originally with 2.5 inch pipe. I lost most of my torque on the low end. I went back to 2.25 and got it back. Myth? I think not.
 

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As the second article goes "here" its correct for vehicles that do not use air flow meter. Now days the Air flow meter measures how much air goes in and it adjusts the fuel needed which does not alow lean or rich combustion there fore not burning the valves. And yes lean or rich actually burns hotter than perfect a/f mixture.

Binary king you still have that tail pipe?
 
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