[CROCIE JR]

I have tested a lot of complete exhaust systems on engine dynos and chassis dynos. Thats why I say what I say. All engines are different. To paint with a broad brush here and say it works for this guy or that guy is cool with me. So are you saying that hotter gasses take up more room than colder gasses? BTW, did I try to put smaller tail pipes on the dyno, no. Did I baseline with open headers and a collector extension, yes. Havnt seen a complete exhaust make more power than open headers. Have I done back pressure testing at multiple spots along a system, yes. I simply use this dyno info to jet accordingly, and say to myself " that system only sucked X of the top." I dont know why other people say what they say or do. I test in a controlled environment and use math and stuff. You guys do what you want to do. Most of the time your minds are already made up. I'll just stick to my book learnin'.

[CROCIE JR]

3.5" oval. Busch series Flowmasters.

[78w72]

Originally Posted by CROCIE JR

I have tested a lot of complete exhaust systems on engine dynos and chassis dynos. Thats why I say what I say. All engines are different. To paint with a broad brush here and say it works for this guy or that guy is cool with me. So are you saying that hotter gasses take up more room than colder gasses? BTW, did I try to put smaller tail pipes on the dyno, no. Did I baseline with open headers and a collector extension, yes. Havnt seen a complete exhaust make more power than open headers. Have I done back pressure testing at multiple spots along a system, yes. I simply use this dyno info to jet accordingly, and say to myself " that system only sucked X of the top." I dont know why other people say what they say or do. I test in a controlled environment and use math and stuff. You guys do what you want to do. Most of the time your minds are already made up. I'll just stick to my book learnin'.

yes, i am saying, based on numerous info & testing i have read from reputable sources, that hotter gasses expand more & therefore need bigger pipes compared to cooler gasses. makes sense to me & sounds like its based on facts of physics. are you saying that's wrong? nobody is saying a complete exhaust will make more power than open headers... where did that come from?

my reply to your initial post was simply asking for more info on your statement that a 2.5" exhaust is ok on 550+hp engines... i asked what a 3" would have done in comparison. please elaborate on that with "math & stuff" & "book learnin."

not sure why the negativity in your reply, "you guys do what you want to do. most the time your minds are already made up." i wasn't doubting you, i was asking for more information based on your statements. sorry if that offended you.

thanks everyone for the help & pics.