[rc5liter]

Does anyone know how many hp you can make before BBK's 2.5" h-pipe with cats will become restrictive?

[1989Gt.]

dude any way you look at it they restrict about 3-10 hp tops depending on how much your putting down im sure not much..

[AdderMk2]

Originally Posted by rc5liter Does anyone know how many hp you can make before BBK's 2.5" h-pipe with cats will become restrictive?

more than you will ever make, asking questions like that.

[DigitalDC89]

have cats will ALWAYS be a restriction no matter how you look at it.

[rc5liter]

Originally Posted by AdderMk2 more than you will ever make, asking questions like that.

thanks for the useless smart ass reply - douche bag

[orangestang42]

the high flow cats arent really any more restrictive than without them, i think the hp difference is like 1 or 2 if that....

[rc5liter]

ive read guys are using 2.5" x-pipes with cats on their modified 03-04 cobras so i think ill be fine flow wise im ~400 at the engine. thanks for the responses

[orangestang42]

yeah im running an x pipe with cats also, can deffinitely feel the difference when i took the stock ones off though, i dont even know why they put those on from the factory

[AdderMk2]

Originally Posted by rc5liter thanks for the useless smart ass reply - douche bag

keep telling yourself that. But when you need REAL advise.. dont bother asking me. This forum is full of retards anyway, so you should fit right n.

[Dap1991]

lol

[liche]

Originally Posted by AdderMk2 more than you will ever make, asking questions like that.

Actually thats a valid question. not sure why you have to be a dick about it.

The effect of losses within the exhaust, due to the restrictive nature of a catalytic converter, is non-linear. Loss is a direct function of flow velocity where a lower velocity flow (i.e. lower hp engine) results in much lower losses than an exhaust exhibiting high velocity flow, where losses are much greater. And as stated before, the losses vs. flowrate is non-linear - and can approximate an exponential function is some cases or certain portions of the loss curve.

Therefore, the original poster, as it seems to me, was trying to ascertain what ballpark hp range (if thats something even known) that the losses would be practically negligible and not an issue.

[EscortSportage]

Originally Posted by orangestang42 the high flow cats arent really any more restrictive than without them, i think the hp difference is like 1 or 2 if that....

it prolly effects sound more than anything, assuming the cats are clean and not clogged hi flow cats flow good, (but i dont have any )