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Message: <blockquote data-quote="Acoustic" data-source="post: 551268" data-attributes="member: 728">Piping Size (outer diameter)?i) 2inii) 2.2in / 2.3in. sifu EG9 and EFN using 2.38. very good too. Piping Route?Why Ferrari 450bhp twin pipe only 2 inches each? Why Mclaren F1 road car 600bhp twin pipe only 2 inches each? Why super-sonic jet fighter have to close nozzle to smallest to achieve fastest mach 2 or 3 speed?Piping Material?i) Stainless steel. you may want to spray it black too.ii) Normal Steelstainless steel weld and material will crack MUCH faster than glawanise (if spelled correctly???) That's why all shops try to sell because you'll go back to repair and replace faster. Spray black paint will get burned and turn to ash. I don't know any special paint which will last 600 to 700 celcius at extractor and 400 to 500 celcius at middle pipe. If got, sure expensive. For what?  Mid-section?i) Mid-boxii) Bulletiii) Swirl bulletiv) Nothing (will ve very loud)Never use swirl bullet because - <a href="http://www.my-acoustic.com/Car/intake_exhaust/mufflers/mufflers.htm" target="_blank">http://www.my-acoustic.com/Car/intake_exhaust/mufflers/mufflers.htm</a> read the last section  Rear-section?i) Straight-flow muffler (since you indicated 60% performance)ii) S-flow muffler (will be quieter)The best straight flow I've seen many people here use is Apexi N1. Nearly no sound.</blockquote>

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