I have a set of borla uel's i will sell you for 400 bucks. Pretty hard to find these days. Uel is a good enough for 400 and under horses. When you start to build for more hp, the uel design creates unequal cylinder heating, leading to premature engine failure and extremely awkward pulse widths, minimizing horsepower. Any upgrade over the stock cast design will be an upgrade. But kind of a pointless one, if you don't have the rest of your exhaust modified to allow for increased flow.