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I just installed the TPIS LT's along with Random Tech Free Flow Cats and X-pipe. Not only was it worth a kick-in-the-pants as far as performance but also emits a nice low rumble through the Corsas.
I bought mine used from another Forum member. Personally I think all this stuff is rediculously overpriced but that's what people are willing to pay so these vendors (as nice as they are) are gladly taking our money. You too can get 10-20 more hp for only $1500!
I've had the TPIS long tube on my car for about a month. Definate change in the exhaust... nice low rumble thru the magnaflows and picked up about 3 tenths in the quarter. Hard to judge exact pickup because of weather conditions. Before the headers I couldn't break 12's in the heat... after it ran 12.88 on the brakes!