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<blockquote data-quote="Sonic Blue GT" data-source="post: 4520984" data-attributes="member: 43138"><p>Well I decided to go with the Ford Racing shorties.... I have too much invested in the CORSA X-Pipe and CORSA axlebacks to go with long-tubes and then have to buy the remaining exhaust kit as well because long-tubes don't match up to the stock cats. So we will see what actual gains I make. I will report back what I make beyond what I have posted in my Sig.</p><p></p><p>Hopefully I will get at least 3 HP...that will put me just over the 300 RWHP mark...which is what these cars should have been making off the production line....That's the one thing that pisses me off about Ford....most folks don't know that when Ford reports HP its always at the flywheel. When people see my dyno-sheet they always ask why it doesn't make 300 as Ford claims? Even I ask that though I was aware of it when I bought the car.</p><p></p><p>I read in a book (S. Hyland?) about Ford 4.6 liter modular engines that the shorties usually make 3 to 5 RWHP with the stock H-pipe and a little more with x-pipe. I have an X-pipe so here is hoping. 8 would kinda make me feel the cost was worth it. It also stated that the primary reason shorties make power is because the exhaust is able to get out of the engine quicker and therefore the heat doesn't have a chance to backflow into the cylinders. Also with headers it takes much less time for the cats to light-off than if the stock manifold was on it. Both of these factors considered the header allow the engine to run cooler and therefore parasitic power drain due to heat is considerably diminished.</p><p></p><p>The book went onto explain the reason that long-tubes make considerable power and torque. It sounded to me as if the extra header length sort of acts like an after-burner to give a chance for any unburned fuel to burn up....that's my interpratation of what I read. </p><p></p><p>If nothing else at least the shorties will probably sound a little smoother and deeper and probably a small bit louder at WOT and at idle.</p></blockquote><p></p>
[QUOTE="Sonic Blue GT, post: 4520984, member: 43138"] Well I decided to go with the Ford Racing shorties.... I have too much invested in the CORSA X-Pipe and CORSA axlebacks to go with long-tubes and then have to buy the remaining exhaust kit as well because long-tubes don't match up to the stock cats. So we will see what actual gains I make. I will report back what I make beyond what I have posted in my Sig. Hopefully I will get at least 3 HP...that will put me just over the 300 RWHP mark...which is what these cars should have been making off the production line....That's the one thing that pisses me off about Ford....most folks don't know that when Ford reports HP its always at the flywheel. When people see my dyno-sheet they always ask why it doesn't make 300 as Ford claims? Even I ask that though I was aware of it when I bought the car. I read in a book (S. Hyland?) about Ford 4.6 liter modular engines that the shorties usually make 3 to 5 RWHP with the stock H-pipe and a little more with x-pipe. I have an X-pipe so here is hoping. 8 would kinda make me feel the cost was worth it. It also stated that the primary reason shorties make power is because the exhaust is able to get out of the engine quicker and therefore the heat doesn't have a chance to backflow into the cylinders. Also with headers it takes much less time for the cats to light-off than if the stock manifold was on it. Both of these factors considered the header allow the engine to run cooler and therefore parasitic power drain due to heat is considerably diminished. The book went onto explain the reason that long-tubes make considerable power and torque. It sounded to me as if the extra header length sort of acts like an after-burner to give a chance for any unburned fuel to burn up....that's my interpratation of what I read. If nothing else at least the shorties will probably sound a little smoother and deeper and probably a small bit louder at WOT and at idle. [/QUOTE]
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