X-Pipe hp gain question?

[cobrasvtcoupe25]

I have a 1999 cobra mustang.

How much HP gain should I recieve with a welded in mangnaflow x-pipe with four cats?

How much HP gain with a welded in X-pipe with hollowed-out cats?

Please let me know

Thanks,
Mike Morales

 

[Crzyhrse]

Are you adding two more cats to the X-pipe because your in Commifornia?

 

[Mel96GT]

Most manufacturers state there is no difference in HP from catted to non-catted X pipes. The hi-flow cats seem to be very efficient. FWIW, I read an article in a Mustang Mag from a Ford Exhaust Engineer and he stated that hollowed out cats were a bad idea for performance since it screwed up the airflow somehow.

 

[K'Dash]

Most manufacturers state there is no difference in HP from catted to non-catted X pipes. The hi-flow cats seem to be very efficient. FWIW, I read an article in a Mustang Mag from a Ford Exhaust Engineer and he stated that hollowed out cats were a bad idea for performance since it screwed up the airflow somehow.

Probably something to do with back pressure.

catted or non catted it doesn't matter really. Power difference is so minimal between the two you'll never know the difference.

 

[Scorcher2005]

I also think it sound like **** if you hallowed out the cats. Also, the x pipe gain is somewhat dependant on other mods. On a stock 99 Cobra, it may net you 5-10rwhp, possibly more. Now if you were to install a supercharger on the stock Cobra and then install the X Pipe, it may give you 10-30rwhp.

 

[Maza4ever14]

From what i know, all 99 and up mustangs have 4 cats stock.

 

[cobrasvtcoupe25]

Are you adding two more cats to the X-pipe because your in Commifornia?

No, I'm using the stock H-pipe with 4 cats and wleding in a X-pipe instead of the H.

I wondering how much HP would I gain from doing that?

And hollowing them out?

Difference? Benefits?

 

[cobrasvtcoupe25]

Maybe a picture will clarify things.

View attachment 378198

The 2000 Cobra R has the same type of thing. LOOK.

HP Gain #’s please?

 

[Scorcher2005]

You wont notice a thing, maybe 5 hp max. Do you feel better now that someone is giving you a definate answer? LOL.

 

[02nightmaregt]

I've heared that the catted to non catted doesn't really make that much of a difference in power, but i have an off road x with long tubes so i have no cats at all and the power increase was nice. It really depends on how bad your areas inspections are. Thank god i don't have any inspection laws anymore.

 

[cobrasvtcoupe25]

You wont notice a thing, maybe 5 hp max. Do you feel better now that someone is giving you a definate answer? LOL.

Thanks man...

I use to have a integra the was not smog legal and its a bitch in Claifornia even if you know the right people.

Cops are bitches here. Peace

Mike Morales

 

[Mike97gt]

This is why I would never live in CA. Great weather but they make it hard on car guys.

 

[mustangkid05]

you deff wont notice the power, i didn't