Should I use 2.25" or 2.50" exaust pipes, and other exaust questions. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-27-2010, 07:56 AM
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Should I use 2.25" or 2.50" exaust pipes, and other exaust questions.

I'm going to be ordering some tubeing and a flowmaster 40 muffer to put a duel setup on my truck. Do you think their will be much of a difference in power/sound between the two? I'm going to get a set of Hedman headers in a month or 2, so for the moment i would be running the duels off the stock manifolds.

Right now i only have a 2.25" single, so anything would be an emprovement.

Going to run them like side pipes( cant run the out the back gastank and the transfercase and it's skid plate is in the way.)
Also, would i want the mufflers closer or farther away from the motor? does it matter?
I cant run a H pipe, unless i used some T fittings to put one were the Y pipe is. Would it be a waste of money? How do they change the sound? and would it be overkill with a set of headers?
Being that this is a 5klb pickup with 31" tires and 3.55 gears, torque is what i need. I probably will never rev the motor more than 3500, 4000. I want this thing to be a neck snapper at low rpms, not something that has to rev way up.


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Old 07-27-2010, 08:55 AM
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I would ditch the Flowmasters and instead order a set of Magnaflows.I had a set of flowmaster 44's and did not like the performance/sound.I would run 2" pipes off the manifolds(or headers) into high flow cats(if you are using cats)and mufflers with 2.5" inlets and 2.5" outlets.No need for an H pipe or y pipe.Run a pipe/cat/muffler down each side and have them dump out just in front of the rear tires.I would wait until you get the headers and do the whole thing at once and then you are done with it.
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Old 07-27-2010, 09:02 AM
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why in front of the rear tires ? - always wondered this

- Stephen
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Old 07-27-2010, 09:10 AM
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Quote:
Originally Posted by stephen44
why in front of the rear tires ? - always wondered this

- Stephen
Imagine my trucks underside, on the drivers side inside the frame behind the trans/transfercase, is a 30 gallon plastic gas tank,and a skidplate. The stock single is smashed in some places to fit in the space( only 2.25" ), and i couldent fit dueles on that side in the space.

Their isnt room to run them out back unless you smash it flater, or have a 2wd. I guess i could run them out back, but i dont have a bender, and the guys at the speed shop said it would be $400+ for a custom setup in stainless( way too much)

I like the fm40 i have now, it just dumps under the bed, no tailpipe now. Havent ever heard magnaflows. But sence i have a flowmaster and i like it, i'll stick with it. I've ran straight pipe, a cherry bomb, the stock style muffler ( what a restrictive POS, you could hardly feel the exaust comeing out the tailpipe) and the flowmaster, and i liked the fm the best. The straighpipe sounded evil at idle, but got way to damn loud as soon as you touched the gas, and the glasspack sounded ok, but it was really quiet at idle.

No emmishions here.
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Old 07-27-2010, 10:07 AM
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ty - got it !
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Old 07-27-2010, 10:35 AM
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I believe that most of the major muffler manufacturers, Flowmaster, Magnaflow, Dynaflow, etc. have tech departments that you can call. They should be able to help you design the system that will work for you. JMO!
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