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There are lots of brands to choose from ranging in price and performance. If you want a system that require no welding, gives impressive gains, and is coated (including supplied x-pipe) all the way back to your future Corsa's then FLP is an obvious choice. TPIS is another quality system but does require welding. Stainless works and Belangers are other quality brands. Call us when you have a moment... we will give you non-biased advice with dyno numbers to backup horsepower claims... which can very between 13 and 23 on systems we've tested. Good luck on whatever system you choose. Long tube headers really wake up the motor... and IMO add a nice slightly louder sound :)
I have the FLP's and it is truly a diy system that is well-made and definitely a kick in the pants. They're beautiful as well. A buddy and I installed them in my garage on a set of Rhino Ramps.
Included are headers, hi-flo cats, off-road pipes, an x-pipe, quick-change clamps to switch between orp's and cats, high quality gaskets and header bolts. Well-worth the price of admission. I love 'em.