How much hp gain if you remove the cats?
05-31-2009, 08:01 PM
#5
2nd Gear Member
Join Date: Feb 2005
Location: CANADA
Posts: 262
I noticed a big increase when I replaced mine,but thats propably because my 21 year old cats were plugged full of ****. As for a smog delete its not needed when going to an offroad pipe,I think 86 5.0 was talking about a smog delete with cats on,that will cause an issue. I also noticed a substantial exhaust note increase,you cant beat the sound of an offroad H with flowmaster 40s on a 5.0
06-01-2009, 01:45 PM
#7
3rd Gear Member
Join Date: May 2004
Location: Richmond, VA
Posts: 614
With a full aftermarket exhaust setup (from the headers and back) I would say ~5 HP. Otherwise, not much HP gain. But it makes the exhaust sound more throaty. I like it and would recommend it depending on how strict emission laws are your area.
06-01-2009, 01:59 PM
#8
3rd Gear Member
Join Date: Sep 2007
Location: Florida
Posts: 761
I did it mostly for the sound but I had the car on a dyno and it's completely stock aside from the midpipe. It put down 226 hp (corrected for weather) so going by the general consensus that 5.0 Cobras make about 220 stock I'd say the 5-7 hp is plausible.
06-09-2009, 11:03 AM
#9
3rd Gear Member
Join Date: Jan 2007
Location: Texas
Posts: 523
the gains definately have to be more than 5 rwhp...i dont think ive ever owned a mustang (owned alot too) that didnt give me at least 8-10 rwhp with headers alone...full exhaust will give more...not only will headers and full exhaust increase power, it will lay a foundation for future mods that will benifit from a free flowing exhaust...
so dont think of it as just 10-15 rwhp....but the "big" picture
so dont think of it as just 10-15 rwhp....but the "big" picture
06-09-2009, 07:02 PM
#10
Join Date: Jun 2009
Location: Kentucky
Posts: 34
really? i hate all this correction stuff, what did it really dyno at?