TTI v. Accurate

Hi folks, I met a new friend last weekend that also enjoys the old A bodies. As it turns out, he has an Accurate 2.5" H-pipe exhaust system and 340 manifolds that he would be willing to sell for my 318 Duster. Originally I was planning to buy the TTI package from headers to tailpipes.

The Accurate system is very cost effective, and would be a nice addition to the car, but the drawback is that the dumps won't work with a frame/chassis stiffening kit. And the TTI might give a boost in HP and work with a frame kit. But I have to pay through the nose for that. I drive the car for fun, and I'm only interested in a mild build (for now).

So now I'm crowd sourcing to anyone with experience with these exhaust systems; what do you all think?