i hav the 94 idi factory turbo and with radio volume up just a little i cant hear mine but radio off it makes a whizing sound and you can hear it winding down when the excellorator is let off.

 

I have the '88 7.3/Banks turbo. I can just barely hear the turbo if the airbox is off and I'm looking at it and I listen real close!

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Well, someone made the ones at the store.......

 

i have a 94 did factory turbo also and i have the stock down pipe with 4" straight pipe and 6" dual stacks, with the back window open my turbo is pretty loud i guess but it sounds more like the wizzing sound but it does whistle quite a bit when decellerating.

 

Hey Smokin....with the 4' straight pipe, why a stock down pipe ?
I ask because next on my list is exhaust and Im not sure to go 3 or 4" back to a good muffler, do peole ever put headers on these 7.3 s and dual exhaust ?

 

yep. stans headers makes long tube headers for the NA version only. no headers for turbo engines.

 

do you hear it more with that downpipe?

 

The downpipe is the answer. The stocker is too restrictive to spin it up. That is why there is only a 5 hp increase from NA 7.3 to factory turbo. I fitted on a 3" Dp and 4" straight pipe kit out the back for a PowerStroke. Works great. Added very nice power and I can actually here the turbo now. Mind you it is not the same as the bigger aftermarket model turbo's, but I would guess an increase of at least 20hp and 50lbs torque. Increased towing speed over mountain pass from 40 (foot to floor) to 65 (~ 1/2 to 3/4 peddle.). Horse trailer loaded with two horses and gear is about 7500lbs. with another 500 in truck.