Flowmaster 40 series
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Junior User
Joined: May 2007
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Flowmaster 40 series
I plan to get a set of slow master super 40 series. I hear mixed reviews about them. I like what i've seen though, I have questions tho. is there any particular pipe i need to use. A friend of mine has an h pipe going to his does this help anything.
Posting Guru
Joined: Nov 2006
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Well first off, are you running a true dual from your headers/manifolds? If so, the X or H is essential if you want harmonious rhythm from the individual banks from the block. The X or H allows for free flowing distribution of exhaust so the sound at the end of the tailpipes has a nice in sync noise. Without one, it would be like running two differnt motors, and you would notice shotty exhaust and out of sequence backpressure. The Super 40's are nice, that’s what I would buy to. I am sure the other guys have more to contribute, just trying to give you something to work with.
Last edited by FordF350Baby; May 23, 2007 at 08:54 AM.
Post Fiend
Joined: Apr 2006
Posts: 12,281
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From: Saskatoon Saskatchewan
I love the flowmaster 40s sound good and it sure looks good on my truck got pics in the gallery i think it has more power and a bit better mileage really hard to tell its all personal taste though
Fleet Mechanic
Joined: Mar 2007
Posts: 1,398
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From: Simi Valley, CA
you have duals off the headers but does it go to a y pipe and come out at one exit point?? cuz as 350baby said, if you have true duals all the way to seperate exits, then you are really gunna want a h or x pipe, it not only sounds good but like he said it equalises the backpressure and lets the engine run just that much smoother, youll mos def want one, and it seems that everyone who has a 40 series, and thats a lot of people, like them, personally i have a spintech, and i like it, it sounds different than all the other flowmasters out there 
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Junior User
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The duals come out at individual exits i don't have the X pipe though . What about magnaflows. I've heard they're all right but i havent really looked into them are there certain sizes to get if so what should i put on a 302?
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Fleet Mechanic
Joined: Mar 2007
Posts: 1,398
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From: Simi Valley, CA
if you dont have the x or h pipe youll want to put one in when you do the exhaust, i dont know much about magnaflows, but im sure itll sound good, i had a spintech on my 4.2L manual and it actually sounded better on that than on my 5.4L that i have now, so its hard to tell, but pretty much all the major after market companies sound good, borla, magnaflow, flowmaster and spintech, youll prolly want to use 3 inch pipes, thats what i have on mine, sounds excellent, flows well, i dont know much about magna flow stuff
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