Does this actually make that big of difference when a cat back is being considered? It doesnt seem like it would have that large of effect to me..

 

Well if a pipe is not mandrel bent the inner diameter of the pipe is reduced. How much it effects it depends on how much diameter is reduced.

 

If you're turbo'd, it's probably worth the money. If not, then I suppose it's debateable.

But as ILike said, it depends. If you're talking sub 30* bends, maybe not that much, if you're talking 45*-90* probably more noticeable, 90*+ and I think you'll notice quite a difference.

Personally, I'd do all mandrels on any turbo exhaust. You can find reasonable prices around if you're patient and do your research on exactly what you need.