Post your turn down exhaust pictures!
Technical Article Contributor
Joined: Aug 2006
Posts: 7,862
Likes: 0
From: Northern California
Originally Posted by KiCk *** FX4
slightly off topic but how do you like the sound with the two cats cut off? does it sound better? How much did you pay?
Senior Member
Joined: Nov 2004
Posts: 3,397
Likes: 0
From: San Diego, CA
Originally Posted by mSaLL150
you know its illegal to cut any cats in our state Dave...and ive been looking forever for high-flows that are legal and still none in CA for the F150. im quite dissapointed.
I have an h-pipe with no cats on my 87 5.0 and havent had any problems knock on wood
Member
Joined: Jul 2006
Posts: 53
Likes: 0
From: West Memphis, AR
Originally Posted by ONE04FX4
here is some good reading about the h and x pipes.
For any performance exhaust system, some type of crossover connecting the two sides of a dual exhaust system is important because it acts to balance the two banks of the engine. The common H-style crossover is good at balancing sound pulses between the two halves, but does little to promote scavenging because the exhaust gases tend to follow the path of least resistance, which is straight through each pipe rather than taking the 90-degree turn through the H-pipe into the other half of the system. In an X-pipe system, however, where the two sides of the system intersect, the gasses have no choice but to intermingle as they pass through the junction. This promotes improved scavenging effects by smoothing out uneven exhaust pulses from the engine’s firing order. It also helps quiet down the exhaust, resulting in a mellower, less raspy tone. According to Magnaflow, the faster acceleration of the gasses through an X-pipe causes them to flow in a linear fashion parallel to the walls of the tubing rather than tumbling. This “laminar” flowing gas is much quieter than tumbling gas, resulting in an exhaust tone up to 8 decibels quieter than a traditional H-pipe.
For any performance exhaust system, some type of crossover connecting the two sides of a dual exhaust system is important because it acts to balance the two banks of the engine. The common H-style crossover is good at balancing sound pulses between the two halves, but does little to promote scavenging because the exhaust gases tend to follow the path of least resistance, which is straight through each pipe rather than taking the 90-degree turn through the H-pipe into the other half of the system. In an X-pipe system, however, where the two sides of the system intersect, the gasses have no choice but to intermingle as they pass through the junction. This promotes improved scavenging effects by smoothing out uneven exhaust pulses from the engine’s firing order. It also helps quiet down the exhaust, resulting in a mellower, less raspy tone. According to Magnaflow, the faster acceleration of the gasses through an X-pipe causes them to flow in a linear fashion parallel to the walls of the tubing rather than tumbling. This “laminar” flowing gas is much quieter than tumbling gas, resulting in an exhaust tone up to 8 decibels quieter than a traditional H-pipe.
Technical Article Contributor
Joined: Aug 2006
Posts: 7,862
Likes: 0
From: Northern California
Originally Posted by KiCk *** FX4
who is going to know
I have an h-pipe with no cats on my 87 5.0 and havent had any problems knock on wood
I have an h-pipe with no cats on my 87 5.0 and havent had any problems knock on wood
Thumper hurry up and get your chit installed so we can hear it!
Senior Member
Joined: Jan 2006
Posts: 1,258
Likes: 0
Originally Posted by KiCk *** FX4
slightly off topic but how do you like the sound with the two cats cut off? does it sound better? How much did you pay?
I just pulled my duals off and left the Roush muffler to see how it sounds. I might run straight pipes but I'm not sure yet.
Senior Member
Joined: Jan 2006
Posts: 1,258
Likes: 0
Originally Posted by mSaLL150
you pulled them off or they fell off?? 
Well a nut fell off on one side and I lost a tip the other day somehow so I just said **** it and unbolted everything.
Last edited by captain morgan8; Sep 12, 2007 at 03:30 PM.