Rick#7
Well-Known Member
- Thread starter
- #1
Although the stock cat-back exhaust on the GT is 2.5", the mid-pipes between the cats and the cat-back connection is only 2.25'. There's also some pinch welds along those pipes that make me suspect the inner diameter at some spots may be closer to that of a 2" pipe.
I already have a 3" cat-back exhaust on my car, so I'm looking at whatever improvements can be made ahead of that without actually removing the cats. I happen to have a set of off road 2.5" mandrel bent pipes left over from my V6. I know they don't fit up to the GT exhaust manifolds, but I was surprised to see when comparing them that they line up perfectly with the after cat mid-pipes all the way to the cat-back connection. So, I started thinking about cutting the off road pipes just above the upward bend with a slight angle to mate up with the bottom of the stock cats. The angled cut on the 2.5" pipes would make a roughly 2.5"x2.75" opening that I could cut a matching sized opening in the bottom of the cats that would then be welded together to make for a smooth 2.5" mandrel bent pipe all the way from the cats to my cat-back.
My question at this point is would it make any difference? I don't track my car, it is strictly street driven, and I'm not expecting any real noticeable change in the butt-dyno, but I like the idea of correcting factory short-comings and improving efficiency where I can as long as it's cost effective.
Would it make any change in the exhaust sound or volume?
I already have a 3" cat-back exhaust on my car, so I'm looking at whatever improvements can be made ahead of that without actually removing the cats. I happen to have a set of off road 2.5" mandrel bent pipes left over from my V6. I know they don't fit up to the GT exhaust manifolds, but I was surprised to see when comparing them that they line up perfectly with the after cat mid-pipes all the way to the cat-back connection. So, I started thinking about cutting the off road pipes just above the upward bend with a slight angle to mate up with the bottom of the stock cats. The angled cut on the 2.5" pipes would make a roughly 2.5"x2.75" opening that I could cut a matching sized opening in the bottom of the cats that would then be welded together to make for a smooth 2.5" mandrel bent pipe all the way from the cats to my cat-back.
My question at this point is would it make any difference? I don't track my car, it is strictly street driven, and I'm not expecting any real noticeable change in the butt-dyno, but I like the idea of correcting factory short-comings and improving efficiency where I can as long as it's cost effective.
Would it make any change in the exhaust sound or volume?
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