September 10, 2007Damn, i've been reading these threads for hours and can't find the answer to my specific question. I have a 2000 Manual GT Mustang and i ordered an exhaust to switch the stock one out. I bought 2.25 headers, 2.25 flows, and my cousins friend installs exhausts so he's gonna fabricate a H-pipe for me and the rest of the exhaust needed. For this specific car is 2.25 or 2.5 better? If so, should it all be the same size or should the tips or H-pipe be smaller or bigger. I want to keep low end torque. Also, how does one know if their vehicle is the high-ouput model?
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September 10, 20072.5 all the way back from the stock manifolds should be fine for torque (pretty common setup, actually). The stock manifolds (or headers, if you have a 5.0L) are so restrictive that you can't do much to kill torque.
I don't think there's any point in stepping the h-pipe sizes unless you have a computer program to analyze what RPM ranges would benefit.
Yes, you have the 'high output' version - the stronger SOHC 4.6L V8 GT's started in '99.
September 10, 2007You can use 2.5" exhaust on a V6 from the headers and back without any worries too. So the V8 better handle it
September 12, 2007You said 2.5 all the way back from the stock manifold should be fine, but i'm awaiting shipment of 2.25 headers. And i already bought 2.25 flowmasters. Basically what i'm asking is does the pipeage width linking the h-pipe to the flows matter, the pipeage width of the h-pipe itself, and also the pipeage width from the flows back to the tip matter? Should we fabricate them 2.25 the same as the rest of the stuff i got or should i fabricate em 2.5?
Ps. Thanks for the advice fellas
September 12, 2007Just stay with the 2.25 unless you plan on do some serious mods in the future
Isn't stock GT 2.5"?
September 13, 2007At least for my '94, the stock stuff was called '2.25'. It was cheaply bent by the factory, though (not mandrel bent) so it had kinks that reduced the size at every turn. And it got smaller near the muffler (about 1.875") if I remember right.
September 13, 2007I would go with a proven H pipe, not a friends fabricated one, Its worth the extra $ for proven Technology