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Old 05-12-2005, 12:16 AM   #1
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exhaust advice/help needed

Well, after finally getting my factory cat and new flex pipe on, I now have an almost stock SVT exhaust (except the Magnaflow muffler and the removal of the rear resonator), all from the previous owner. Now, the mid-pipe (the long exhaust pipe after the flex-pipe and before the muffler) has been replaced with a straight thru 2.5" pipe. This was quite crackly when decelerating and I fear the torque suffered because of its diameter. I replaced this with a 2.25" pipe to help the torque, but it still pops and backfires when gearing down/decelerating so nothing was really accomplished! Should I put a resonator in the pipe mid way or perhaps a glass pack to help the noise and should I do it on the bigger pipe or the current 2.25" pipe? Could that small a difference actually hurt the torque? Tha car runs fantastic but I hate raspy exhausts as it cheapens the car imo. Thanx to everyone that helps! Todd


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Old 05-12-2005, 12:46 AM   #2
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NO!!!!! 2.25in.... NO!!! The crackiling is from the engine running rich at about 2000 to 3000 rpms, to really cure that you need to get a tune! Keep the 2.5 or you will suffer in loss of horses and torque, not much but some! Just buy a nice system like magnaflow, mbrp, borla or stock!

Ditch the 2.25 stuff right away!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 05-12-2005, 04:36 AM   #3
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Well I am in the discussion stages (as we speak!) with Wayne at Hypnotic and looks like a tune is in the works but I can't believe that would cure the popping, etc...??! I have no intention of buying an aftermarket exhaust as the SVTs have a stellar set up and the sound otherwise is great, so (almost) stock it will remain. Is the stock SVT mid-pipe a 2.5"? And what exactly did Ford have on the pipe (ie - a second muffer/resonator...?) I'm sure it wasn't just a straight back pipe, but if the tune will help quiet that part of it, I'd just revert back to the bigger one and leave it. Anyone have experience here?
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Old 05-12-2005, 05:45 AM   #4
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I think it is 2 mufflers and a resonator. All the piping is 2.5" on the exhaust, so stick with that. If you want to change anything, get a high-flow cat or an orp (Wayne can hook you up with that as well).
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Old 05-12-2005, 01:37 PM   #5
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Ahh, thanx! I thought it was a full 2.5" but I wasn't positive. I think I'm gonna wait til I get the SCT and see if that resolves in any way the backfire and if not, put the bigger pipe back on and weld a small resonator in there.
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Old 05-12-2005, 01:55 PM   #6
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the stock exhaust on the svt was 2.5? Dam I should have kept my old exhaust.
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Old 05-12-2005, 03:00 PM   #7
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Nope. The factory exhaust is not 2.5".
It's 2.38" mandrel bent tubing.
Weird size I know,
but that also speaks volumes about the amount of work that went into designing it
for the best performance on the stock vehicle.
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Old 05-12-2005, 03:06 PM   #8
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so I down-graded my exhaust when I put on 2.25" piping?
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Old 05-12-2005, 03:11 PM   #9
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WD40 where did that figure come from? Is that from the SVT site?

BTW as for the question about the glasspack, I don't think that would help much to reduce noise, they're generally kind of a noisy muffler with a cheap sound, and since it's going to wear out over time (the fiberglass packing wears down), it will only get noisier.
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Old 05-12-2005, 03:34 PM   #10
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WD40 where did that figure come from? Is that from the SVT site?
Three different threads on this site, when I searched for SVT+Exhaust.

I know, that's a funky number, but 3 different members all said the same thing.

I do know one thing for a fact...it's not 2.5" from the factory.
As you probably know, a lot of the aftermarket systems for the SVT are that size though.

Someone, quick, get a sawzall and start hacking, and put this matter to rest!

EDIT
Hmmmm, maybe 2.28" then...>>>Clicky
The above link lists it at 58mm.
Interesting read too!
I've been to that site, but have never seen that article.
Sure has some cool diagrams.
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