The Jegs/Summit exhaust are made by Heartthrob. While they are a third the price of TTi units, unless you e got the Hooker Super Comp headers, they won't come close to fitting with TTi headers. Ask me how I know... I was under my 70 Superbee tonight trying to get mine to fit. Everything from the mufflers back fit fine. Everything from the fronts of the mufflers to the headers is pretty useless. I ended up using my TTi collecter adapters, a pair of Walker 3" ID to 2 1/2" ID reducers, reversed the exhaust pipes end to end, cut them in two, added a Summit H pipe, tossed out two short pieces that go between the mufflers and exhaust pipes, stubbed the exhaust pipes to the mufflers and clamped it all together. I've got 14 hours into it. Never again.