whats up with the big exhaust extension's

some of you driver's have added large bore exhaust extensions to your stock exhaust and it look's great ,if the difference from stock to large bore is hiddin by the heat shield or the total system was replaced from the y pipe up. but the majority of the truck's that I see it is so obvious four or six inch pipe's up to the muffler and even past the muffler, and then this huge stack or at the top is this huge eight or ten inch 90 degree elbow or staight pipe cut off at a 45 that stick's out like a sore thumb. sorry guy's and gal's but if your in a freightliner classic,
379 pete , or a w-900 kw and have 4 to 6 inch stock exhaust and then it go's to 8, 10, or 12 inch then I'm laughing my ### off !

What's worse than the above is a ups or fed x of abf truck with a 1 foot chrome 90 degree elbow with a 10 inch diameter ! really ,is that supposed to look cool ?

 

sorry we all cant be perfect like you

 

But, but, but.....they look cool ----- don't they???? lmao

 

They're just trying to compensate for something else that's rather... SMALL!

 

sure do my 6 in pipes on top increased my mpg from 6 to 20 mpg. want to buy some lake front property in timbuckto.

 

With all the money your saving on fule you should be able to buy that proterty in Timbukto.

 

I really can't believe that the short extension's help fuel mileage, now a complete system with high flow muffler's or baffeled stack's would be a advantage. One guy told me his boss put it on ( short stack large bore} for emission's regulation's. I walked away trying to keep a straight face !

 

I wouldn't be so fast to laugh, I have no idea what purpose they serve, but if you look at all the DPF-equipped PACCAR trucks, they all have those expanded tips with the holes at the bottom of the tip from the factory. My guess is that the holes are to cool the exhaust down to keep the tip from bluing, but I don't know that.

 

Those are factory stacks put on with the advent of the '07 emission systems... I believe they have the catalytic convertors in 'em.

 

I suppose what you say is possible, I really don't know, most of the one's I have seen look like something you would get at a chrome shop to dress up the truck and it fit's over the stock stack going from 4 or 6 inch I.D up to whatever, still it look's odd