TX Tahoe Z71

iTrader: (28)

So I have 1 3/4" LPP LT's into their 3" Y pipe into my two 3" Magnaflow mufflers (4x14 bullet and 22" big body), then it goes over the axle and out the back in the stock 2.75" pipe.

Riley's Muffler Shop in Houston quoted me around $500 for that section mandrel bent 3" stainless, so I am leaning towards picking up the mandrel pieces on ebay and getting an exhaust shop to weld it together for me. (And yes, I know a 2.5 or 2.75 true dual with an X pipe would be even better, but unless you want to send me a check, not going that route.)

My question is how much horsepower am I missing out on by having the last 4ft of exhaust as 2.75" rather than going 3"? Math tells me the 3" is 19% bigger, so I am leaning that way, but wanted some real world experience or exhaust knowledge.

kbracing96

iTrader: (26)

2.3454hp... Seriously, I don't think you will feel a thing. Definitely WAY better things to spend your money on the adding a 1/4 in diameter to the last section of your tail pipe.

Food for thought. As the exhaust gasses run thought the pipes and mufflers, it dissipates heat and reduces in volume so you are actually needing less pipe to flow the exhaust back there any way

TX Tahoe Z71

iTrader: (28)

Awesome, thanks Kyle! One thing off my long list of truck to do's!

cttandy

iTrader: (12)

Wait, are you running a single tailpipe after the mufflers? I read through your description several times and that is how it seems to be worded.

brent1976

iTrader: (1)

He said y pipe so I would say he has 2 mufflers in series.

TX Tahoe Z71

iTrader: (28)

Yep, two in a series. The bullet then the big body muffler.

cttandy

iTrader: (12)

Well, I do prefer a 3 inch in a single, but I still agree, I don't think you will see any gain. At least not that will be worth while for the money spent.

Wilde Racing

iTrader: (26)

I thought it worked the other way around........

slow67

iTrader: (2)

No, he is correct. Although that doesn't take into account frictional losses from the longer pipe/more bends.

dirty_old_chevy

agreed. the farther the restriction is away from the exhaust port, the less it matters.