BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
06-18-2006, 03:52 AM
#11
5th Gear Member
Join Date: May 2006
Location: Florida
Posts: 3,881
RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ORIGINAL: Tres Wright
Settle down everyone, there's actually truth in both arguments being presented here. If you replace a stock exhaust system with one that flows much more freely (particularly if you remove the cats) and make no other changes, your car may indeed lose power. The reason is because it causes the car to run more lean. In the old days you had to rejet your carb to compensate, but these days if the change is small the car's computer will adjust for it. Here's an article related to this subject, it's for BMWs but you'll get the general idea:
http://www.uucmotorwerks.com/html_pr...torquemyth.htm
Settle down everyone, there's actually truth in both arguments being presented here. If you replace a stock exhaust system with one that flows much more freely (particularly if you remove the cats) and make no other changes, your car may indeed lose power. The reason is because it causes the car to run more lean. In the old days you had to rejet your carb to compensate, but these days if the change is small the car's computer will adjust for it. Here's an article related to this subject, it's for BMWs but you'll get the general idea:
http://www.uucmotorwerks.com/html_pr...torquemyth.htm
06-18-2006, 04:07 AM
#12
2nd Gear Member
Join Date: Mar 2006
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Posts: 170
RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ok so let me get this stright, im planing on buying a midpipe withOUT cats on it.. and i have flowmaster mufflers on my car right now, so will i lose or gain power from this mod? i was planing with going with a O/R H PIPE from MAC.. ivv heard a lot of good things about MAC midpipes and a few bad things, but thats with everything so i feel confindent about going with the MAC's.. anyway... will i lose or gain HP?
06-18-2006, 04:14 AM
#13
5th Gear Member
Join Date: May 2006
Location: Florida
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RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
You will gain... scratching the cats nets a big gain from what I hear (as well as producing a throatier sound). As I have said multiple times already... less resistance for exhaust to exit the pipe = less backpressure = more HP. If you want huge gains, go with no cats and long tube headers.
06-18-2006, 04:23 AM
#15
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RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ORIGINAL: bl1nkage
Exactly, less backpressure is better.
Exactly, less backpressure is better.
06-18-2006, 04:27 AM
#16
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RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
Reaper, check your local laws before removing your cat's. If you have emissions inspections like we have here in TX, you will fail if your cats are removed. You're talking insignificant gains anyway. Opening up the exhaust on a new Mustang running less than 400 HP is basically not going to give any benefits because the stock exhaust already flows pretty good.
06-18-2006, 04:37 AM
#17
5th Gear Member
Join Date: May 2006
Location: Florida
Posts: 3,881
RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ORIGINAL: Tres Wright
LOL! I think you missed the boat, have a look at the article again. It would be more accurate to say "less backpressure is not worse".
ORIGINAL: bl1nkage
Exactly, less backpressure is better.
Exactly, less backpressure is better.
06-18-2006, 04:42 AM
#18
5th Gear Member
Join Date: May 2006
Location: Florida
Posts: 3,881
RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ORIGINAL: Tres Wright
Reaper, check your local laws before removing your cat's. If you have emissions inspections like we have here in TX, you will fail if your cats are removed. You're talking insignificant gains anyway. Opening up the exhaust on a new Mustang running less than 400 HP is basically not going to give any benefits because the stock exhaust already flows pretty good.
Reaper, check your local laws before removing your cat's. If you have emissions inspections like we have here in TX, you will fail if your cats are removed. You're talking insignificant gains anyway. Opening up the exhaust on a new Mustang running less than 400 HP is basically not going to give any benefits because the stock exhaust already flows pretty good.
Also take Tres's advice and dont remove cats if you live in a state with emissions testing. He lives in Tex, he knows his emissions [8D]
06-18-2006, 05:22 AM
#19
2nd Gear Member
Join Date: Jun 2005
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Posts: 331
RE: BE CAREFUL SLP LOUDMOUTHS LOOSE HORSEPOWER.
ORIGINAL: Pony Up
I see a bunch of stuff about the LM's here lately. Yes they are loud (do sound like a blugging boat at idle though) and they do sound good but when I called SLP directly and asked their teck about horse power issues hew did tell me the Loudmouths "DO make the 05-06 Mustangs loose horsepower". He said in order for the set to make sense one must use headers and off road mid pipes amunst other things. He said and I quote "Most dummies just like the sound and are sport car want to be's" as he chuckled. Said they did many different dyno"s to prove this.
Hmmm. Made me think of something else. I did ask if the Power flos had issuse and he said they "DID NOT rid the car of any horsepower". I did buy the Power Flos instead of the Loudmouths. They do have a deeper rumble but are not as "loud" as the LM's.
Just thought I"d chime in and let people who want horsepower "gains" know.
I see a bunch of stuff about the LM's here lately. Yes they are loud (do sound like a blugging boat at idle though) and they do sound good but when I called SLP directly and asked their teck about horse power issues hew did tell me the Loudmouths "DO make the 05-06 Mustangs loose horsepower". He said in order for the set to make sense one must use headers and off road mid pipes amunst other things. He said and I quote "Most dummies just like the sound and are sport car want to be's" as he chuckled. Said they did many different dyno"s to prove this.
Hmmm. Made me think of something else. I did ask if the Power flos had issuse and he said they "DID NOT rid the car of any horsepower". I did buy the Power Flos instead of the Loudmouths. They do have a deeper rumble but are not as "loud" as the LM's.
Just thought I"d chime in and let people who want horsepower "gains" know.
