exhaust gains from after the cats???

[race4food]

Any dyno numbers or other REAL data using the motorsport or other X-pipe and axle back systems??

I'm looking at the Ford Racing Xpipe and Bassani axle back system..

 

[jroc07gt]

The only gains from a mid-pipe is from removing the cats. The stock exhaust is about as perfect as you could hope for.

 

[marcspaz]

Unless you are adding long tubes, everything you do is basicly sound only. Even if you get rid of the cats, that is only good for -5 to +5 rwtq. Some people, like me, lost power. On my car, it moved the power band down into the lower revs. Not good for racing, but nice for a DD.

 

[Kaldar142]

Would an x-pipe produce more power in the top end? I'm thinking of switching

 

[jroc07gt]

Yes, x-pipe has less backpressure than an h-pipe.

 

[marcspaz]

I made a custom cat-less h-pipe about a week ago. I lost a little top-end power, it moved my power curve into the lower rpm's, but bumped up my tq curve from 2k to 4.5k rpm's almost 14 rwtq. That's fun for the street.

So, IMHO, track application = X-Pipe ............. Street only = H-Pipe

I drag race, so I put my catted X back on.

 

[navyman8903]

x-pipes are fine all the time. The GT 500 comes stock with one and so does the Shelby GT. You will pick up some ponies with the stock cats if you get the bassani race axle backs, and the x pipe should be good for 10-15 rwhp topend.

 

[Kaldar142]

I made a custom cat-less h-pipe about a week ago. I lost a little top-end power, it moved my power curve into the lower rpm's, but bumped up my tq curve from 2k to 4.5k rpm's almost 14 rwtq. That's fun for the street.

So, IMHO, track application = X-Pipe ............. Street only = H-Pipe

I drag race, so I put my catted X back on.

WOW, it was THAT much of a difference? so you could feel the difference on H vs X pipe?

 

[navyman8903]

My question is after you launch in a street race when are you below 3500rpms?

 

[lostsoul]

Unless you are adding long tubes, everything you do is basicly sound only. Even if you get rid of the cats, that is only good for -5 to +5 rwtq. Some people, like me, lost power. On my car, it moved the power band down into the lower revs. Not good for racing, but nice for a DD.

thats it for removing the cats? =-/

 

[jroc07gt]

Almost every car dyno's about 5-10whp higher without cats.

 

[lostsoul]

Hummm I might get more with the mac 1 3/4 ST headers and no cats. I thought I would get 20rwhpl+ ahah

 

[pieperz06]

i felt a big difference when i added my O/R-h and for 130 bucks i think it is worth it because i also like the sound with the stock mufflers

 

[fullsayl]

Any dyno numbers or other REAL data ...

OK, just wanted to point that out. I'm done now.

 

[marcspaz]

WOW, it was THAT much of a difference? so you could feel the difference on H vs X pipe?

Oh yea. It was a lot more fun to drive on the street.

My question is after you launch in a street race when are you below 3500rpms?

I don't know. I don't race on the streets...

thats it for removing the cats? =-/

I lost 7 peak HP, and that was after retuning. Removing the cats really changes the sound more than anything.

OK, just wanted to point that out. I'm done now.

Sorry, I didn't print the dyno sheet that shows I lost 7 HP with a cat-less X, but my sponsor saves all my files for me if you really want me to print it and post it... LOL

 

[fullsayl]

Sorry, I didn't print the dyno sheet that shows I lost 7 HP with a cat-less X, but my sponsor saves all my files for me if you really want me to print it and post it... LOL

LOL - Sorry Marc that wasn't directed at you, just some of the other numbers being thrown out there were making me giggle

 

[navyman8903]

If you look at the fastest cars they all have x-pipes......or turbos.

 

[marcspaz]

LOL - Sorry Marc that wasn't directed at you, just some of the other numbers being thrown out there were making me giggle

LOL... I know. Just havin' fun