TBE Question-Mandrel Bent- That Important? - Subaru WRX Forum
 
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#1 Old 02-29-2008, 05:05 PM
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Question TBE Question-Mandrel Bent- That Important?

Well, since my brother works at an exhaust shop, he can make me a Cat-Back for only $85, and he hand makes muffler for our cars, but at his shop, they only have the press bender, it's not as smoother and same diameter through the bends, but a press bended CBE paired with an Invidia DP will only cost me little over $300... But does it make THAT big of a difference if the CBE isn't mandrel-bent? Thanks

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#2 Old 02-29-2008, 05:07 PM
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no, that'll work fine. It's all for sound anyway. cat backs aren't a restriction on a WRX. Personally though at that point I'd just keep the $85 and leave the stocker.

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#3 Old 03-03-2008, 01:19 PM
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really? what about just an axle-back? because usually on most cars just the muffler can restrict you 5-10hp, and my bro can hand-make me an axle-back muffler for like $15... What size is the stock piping on the wrx?

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#4 Old 03-03-2008, 01:49 PM
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the stock is not a restriction. The one your brother makes for $15 might be worse but certainly not better. The stock piping size is a very ample 2.25" which is plenty for a small 4-cylinder.

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#5 Old 03-03-2008, 01:59 PM
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oh ok, thanks, then i can save up this extra money for something better

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#6 Old 03-03-2008, 03:29 PM
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I find it hard to believe there are many cars that get 5-10hp from a mufler change. The physics of internal combustion just don't seem to agree with that in my head.

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#7 Old 03-03-2008, 03:35 PM
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well, i'm not exactly sure about 5-10hp, but they can create a very noticeable difference in changing out for a performance muffler, not necessarily a fart can, but a nicely built muffler. My brother basically hand-made the muffler on his car, and our buddies Scion tC. On the tC we have had about 3-4 different mufflers, that my bro has hand-made. And we design the internals for different gains, the 1 on my bro's Altima is very straight-through style, so it gained hp up top, but on my buddies tC, we designed it to keep backpressure and increase torque on the bottom end, which allowed the tC to get our record of an amazing 6.5-ish 0-60 with only an K&N drop-in, and our hand-made muffler...

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#8 Old 03-03-2008, 03:40 PM
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on a turbo car, the turbo itself provides abundant backpressure so exhausts are as straight through as possible. I find it hard to believe the muffler really gave any gains to the Tc either but that's neither here nor there. The only way to accurately measure power is on a dyno.

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#9 Old 03-04-2008, 03:18 PM
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thats what my step dad is saying, but i know it doesn't make much sense, but it's definately happening. It's realy noticeable when we put a Flowmaster race muffler on it a little while ago, it took away some of the low-end torque, but it hauls some serious buttox when it get's going now. I know it's confusing, but it really does help. With our insane-bottom end giving muffler on that tC, he fended off an Acura RSX type S until around 85mph... The type S has 40 more hp stock. BUT it has a pitiful 130tq at the crank, and the tC has a nice 162tq at the crank. So with the addition tq gains from the specially designed muffler, the tC could pull ahead on the type S until the type S hit it's power-bands, and the tC dropped out of it's...

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