gforcejunkie

My '00 GT's exhaust is popping when you do long downshifts. I don't know much about Mustangs, but, on my bike it stopped doing that when I richened it up.

It's got the larger t/b & plenum with h-pipes and slp loudmouth exhaust. It's got cats (2, I think) but no MIL Eliminator. Runs great, good mileage.

Also, the check engine light came on yesterday with 2 codes, PO171 & PO174, boths banks too lean. Reset it today and the light stays off, at least for now.

bull8t

mine rumbles when I downshift......how many rpms are you downshifting at??

LS1mustang

you hafta run the MIL eliminators for the other 2 cats.

SLP loudmouth- you have any sound clips?

gforcejunkie

Thanks for the info. Mil eliminators about $69 for the plug in kind right?

I'll try to get a sound clip another day.

LS1mustang

I dont know what the price is.
The internet is your friend www.google.com

jdaniel

Mine rumbles most of the time and sometimes when its cold it pops a little louder but I like it when it does that.

USAMuscle

Take the mufflers off and it pops like a ****. The better your mufflers flow, the more you'll hear it.

gforcejunkie

Yeah, it definitely pops more when it's cold.

I wonder if the mil eliminators will help with the popping by richening up the fuel/air mixture a bit or just keep the check engine light from coming on.

86HOGT

Yeah mine pops when I rev it. It happens more on the "down rev", is what I think you're trying to say. Also between shifts because of the little down rev there. Happens more when cold. I think that happens more when it's cold because the pipes are a lot colder than the exhaust air and when it hits the cold pipes, it has more tendency to pop, maybe?

bobby

the 05 is the same way