man i'm all about noise and i think i'm just gunna get the stacks. i asked my uncle today about it and he was tellin me that black smoke is badass but you kill your mileage when you do that. and payin 4.20 a gallon aint too easy on my wallet. so now i gotta decide between 5 and 6" bullhaulers or aussies. what do you think heavyduty?

thanks, clay

 

you know they make 7 inch aussies now

You can get a quad max mileage thatl boost you up to 22+mpg. you only waste fuel if you have a heavy foot. you can squeeze over 20mpg with an economy tune. or you can get a quad xzilleraider that is adjustable on the fly for smoke or mpg.


But if you want stacks....

 

would you get the 7"s though? i heard they can hurt your HP and torque really bad.

 

stacks won't hurt your hp...no matter how big they are. it's the pipe leading to them.

 

i would

anything past 4 inches wide hurts hp and trq(if your not making over 500hp) and mpg.

if you want sound 5 inch turbo back to 7 inch aussies will give you one deep tone.

---AutoMerged DoublePost---

yes 4 inches is about as big as you can go with out losing power, but 5 inches sound better IMO and you only lose like 5 hp anyway if that with a 5 inch down pipe

 

can i buy a 5" cat back system online and then buy the stack kit with it or would it be cheaper to buy it at an exhaust store. i know one in town but i dont know if they carry 5". i guess i can just go to a truckin company to get that pipe

 

Theres vendors on this website that can give you great deals on stacks. Just make a new thread in this forum Price Quote - Request A Price - Diesel Bombers and ask for a price on what exhaust system you want.

Even if you ask for just 7 inch stacks they will help you with getting you what u want with all the hardware and piping for a good deal.

 

but can i just keep the stock 4" turbo back pipe and run that to the stacks, whether they are 5,6, or 7"? cuz if i redo all the turbo back pipe its gunna cost me another $300-500.

thanks, clay

 

I believe so, you can still use your 4" down pipe i think.

the only parts of the system that is 6 or 7 inches are the stacks itself. the rest is either 5 inches or 4 inches that includes the Y pipe, flexpipe, elbow, and down pipe

 

you can get a kit to adapt right to your 4", most kits though go five inches into the y-pipe that goes into the bed and to the stacks. But that's no big deal, just order a 4-5 inch adapter instead of 5-5 inch.