can the LB7 sound like the LLY?

kooshdaddy · 02-20-2007, 12:49 PM

My bother in law has the LLY and that thing whistles like a jet motor, my father in law has the LB7 and it is a low-loud rumble, both are straight piped fromt he turbo back, but my brother in law has 5" exhaust and my father in laws is 3", The LLY has a programer, and a cai, all my father in law has is a k&n air filter, Can we get the LB7 to sound the same? And how can we do it? thanks

**TYREBOYZ_DEMAXIN** · 02-20-2007, 01:50 PM

yes just put a 5" on the lb7.On my lly with a stock pipe made into a straight it whistled real loud,i even had guys wondering if i was running twin turbos.then i put a 5" turbo back magnaflow exhaust on and it really rumbled under full throttle,but then i switch to a dual 4" silverline turbo back exhaust and put the 5" on my 06 lbz.ps the 5" sounds the best.

**TYREBOYZ_DEMAXIN** · 02-20-2007, 01:53 PM

Quote:

Originally Posted by kooshdaddy

My bother in law has the LLY and that thing whistles like a jet motor, my father in law has the LB7 and it is a low-loud rumble, both are straight piped fromt he turbo back, but my brother in law has 5" exhaust and my father in laws is 3", The LLY has a programer, and a cai, all my father in law has is a k&n air filter, Can we get the LB7 to sound the same? And how can we do it? thanks

quick question what exhaust does your brother'n'law have

zane · 02-20-2007, 02:08 PM

My dad has a 05 powerstroke with a 4" turbo-back straight and when it is idling the turbo is really loud like a jet. I heard that on the duramax that it will never whistle like this. I have an LBZ and was wondering if a 5" turbo back straight would make it whistle really loud like this?

dieseld · 02-20-2007, 02:58 PM

I installed a AFE air box on my lb7 and it really made the wistle stand out. Did not really notice anything after the turbo back exhaust. The air box made a difference. Towing heavy at 70mph with the passenger window open you can really hear the high pitched wistle. SOUNDS AWESOME.

Keep in mind LB7's had a fixed vane turbo un like the variable one in the newer models. The 6.0 powerstroke is a different animal all together but at least my LB7 still pulls strong with 110k miles on it and still gets better fuel economy.

**TYREBOYZ_DEMAXIN** · 02-22-2007, 05:43 AM

Quote:

Originally Posted by zane

My dad has a 05 powerstroke with a 4" turbo-back straight and when it is idling the turbo is really loud like a jet. I heard that on the duramax that it will never whistle like this. I have an LBZ and was wondering if a 5" turbo back straight would make it whistle really loud like this?

yes it will whistle if you install the 5" turbo back with out the muffler that comes along.like i said i have a 06 lbz and i installed the 5" magnaflow with out the muffler that came with it and it whistled,so installed the muffler and that took care of that problem.it sounds mean with a 5" and i love it

messr84 · 02-24-2007, 02:11 AM

Yeah I have had buddies ask me if I have an extra turbo under the hood...all it is for exhaust is the 5 inch straight back with the lb7 engine....Give the throttle a punch and it will put a smile on ur face!!

**TYREBOYZ_DEMAXIN** · 02-24-2007, 06:38 AM

you got to love the sound of a 5" exhaust

,i noticed with the muffler on it cuts the whistle and it grummbles a little bit when it idles,i think i like it better that way.

sgt dave · 03-03-2007, 10:15 PM

i live in california, if i replace the down pipe and remove the catalytic converter would that have an effect on the computer, or make the check engine light come on?

redneck1572 · 03-04-2007, 12:23 AM

No it shouldnt. I cut right behind the cat and knocked all the packing out then cut out the muffler and it made it quite a bit louder plus u can hear the turbo wind alot cleaner!!!!