From what I've seen and heard, Kooks LTs with no cats and the Solo exhaust is a pretty insanely-loud system. Not to mention you're talking about $1,850-$2,000 between the two, especially if you go with the 3-inch system from Solo (you'd be dumb not to at that point). Whereas with the TSP headers, I can buy a decent axle-back, then save up for the headers and X pipe and be into the whole system roughly $1,400-$1,600 depending on the axle back, or just $1,000 if you keep the stock mufflers. TSP's stuff is pretty nice. Sure Kooks stuff is nicer, but they also want an arm and a leg for it. I'd love to do a set of Kooks long tubes with a 3-inch Magnaflow cat-back, as I think it would be the perfect amount of loud, but we're talking $2,000+ for that too. That officially would make the exhaust the most expensive mod on the car by far. I could put a cam, DOD delete and have the heads ported for that much. Seems like the TSP stuff might be a good middle-of-the-road option for those that don't want to go with OBX/Maximizer stuff.