oh boy my wifes gonna kill me

[avaya]

this morning i woke up and started the day by moifying my stock 03 excursion

new volant intake then juice platinum with attitude. after these two i drove her to the hardware store and all was great. got home and figured i would start the exhaust. it is a 4 inch mprp turboback for the excursion. had a nightmare of a time gettiing the old out . especially down pipe. but i did it. dusk comes i finish up with a halogen lamp. start it up and it sounds good sittin in the driveway. i decided i would go get ice cream for kids and test it out and holy crap as soon as i put a touch to the gas pedal it sounds horrible. i dont mean outside i mean in the cab. can feel vibration in the gas pedal it so bad. sounds like floor boards are gonnna shake loose. it seems to buck a bit. if i had to describe the sound its like stickin a ball card in the spokes of your bike ( times 100 ). im scared to death to drive it in fear of screwin her up big time. does anybody have a turbo back mbrp on an 03 excursion. i can understand a little noise but this is ridiculous. luckily i have tommorow to fix it. unfortunately my old exhaust is in pieces. the truck is a 6.0 . please help and i look forward to the advice from the knowledgable people in this forum brian

 

[Russ]

Sounds like the down pipe is hitting some where on the body, Crawl under it when the sun comes up and make sure you have enough room around the pipe.

 

[bushpilot]

is the down pipe hitting the fire wall ?

i have a turbo back mbrp on my 2004 6.0 mine sounds fine...
im using the mbrp muffler & cat delete pipe....no problems.

youve either got a leak at the down pipe or some
where close...or the a bit of pipe is hitting something.

 

[Zookie400]

definatly sounds like you have contact somewhere, likely the downpipe, possibly a hanger contacting metal to metal somewhere.

HANG AROUND HERE....we have a lot of helpful people!

post up some pics of the X

 

[avaya]

thanks for the quick responses
in the morning ill go over it very closely. the one thing i did notice was i was leakink a small amount of air at the cat. the existing bolts were so crappy with rust i thing it would be impossible to get a good seal. i was just gonna get the cat delete. but after this bit with driving like a wreck i got gun shy.on a side note the turbo whistle is amazing thanks again

 

[bushpilot]

definatly sounds like you have contact somewhere, likely the downpipe, possibly a hanger contacting metal to metal somewhere.

HANG AROUND HERE....we have a lot of helpful people!

post up some pics of the X

GOOD point...i had to cut one of the "hangers" that was welded
to the MBRP...it was too long and would have been bangin' against
the frame....i probably cut a good 2 inches off the one hanger.

 

[big_rooster]

check yer cross member too mine doesn't have much clearance above it and will some times lay on the cross member

 

[avaya]

problem solved

amazing
went out this morning and checked the down pipe and sure enough it was hitting where the top and bottom were welded forming a bit of a flange. after i backed the bolts out and adjusted it away i took it for a spin. the noise was absolutely gone in fact i find the exhaust to be HARDLY louder than stock. the whistle is through the roof. thanks again to the people who gave advice. you can imagine the noise being like i left a wrench in the turbo blades. i was scared to drive her .

 

[bushpilot]

install a cat delete pipe and open up that exhaust a little more.
the exhaust doesnt get "loud" until youre full throttle...

 

[Sawboy]

Bush is right. Say buh bye to the kitty. The sound is awesome then. Especially juuuuust before the shift points under hard acceleration!!!!!