MustangForums.com - View Single Post - 05 -07 GT Exhaust Systems

callahan · 03-24-2006, 08:37 PM

I installed the Borla cat-back system on my '06 GT. Perhaps the best case for a cat-back and not a axle-back system is this:
Even though the factory uses 2.5" mandrel bent tubing, just before the mufflers there is a section where there is a major crimp in the tubing that will increase back pressure. Poiselle's law in a nutshell states that if you decrease the diameter of a tube by half you increase resistance 16 times.

03-24-2006, 08:37 PM	#25
callahan 3rd Gear Member Join Date: Mar 2006 Vehicle: 2009 mustang gt Location: ohio Posts: 507	RE: 05/06 GT Exhaust Systems I installed the Borla cat-back system on my '06 GT. Perhaps the best case for a cat-back and not a axle-back system is this: Even though the factory uses 2.5" mandrel bent tubing, just before the mufflers there is a section where there is a major crimp in the tubing that will increase back pressure. Poiselle's law in a nutshell states that if you decrease the diameter of a tube by half you increase resistance 16 times. __________________ 2009 bright silver automatic mustang gt deluxe. Magnaflow axle back oval exhaust. Pioneer radio/cd/mp3/i-pod with 4 infiniti 6x8 kappa speakers, infiniti powered sub-woofer, and alpine 375 watt 4 channel amplifier. This is my daily driver (: I use only royal purple 5w-20 oil with 4 oz. tufoil added.