AEM and Inject do make them

a generic muffler = the same as any other muffler, a muffler, well comparing apples to apples....ie: straight through (canister) to straight thorugh for example.....they are all the same. However, I do like the somewhat unique design of the magnaflow muffler that they have out now. It looks pretty much stock, but has a very nice advanced flow characteristic and muffling ability.

However, a muffler does nothing, it's the exhaust pipe, and so long as it's tuned correctly (for 4 cyls it's 200+hp for 2.5" and 200-hp for 2.25") size wise, and it's mandrel bent, it's pretty much all the same within a percent or two.

- Nathan