They are legal noise wise, but i was talking about emissions. CAT ACERT suppose to have catalytic converters in it. I was quoted $2500 each(i've got 2) at KW dealer.

Why not just buy the donaldson 1000463 for $70.00 from ryder fleet products online? same as the p.p, one. straight thru design without the loud noise. http://www.ryderfleetproducts.com/ry...oductDetail.do

Because the DOnaldson one is only 9" wide, and mine are 11" wide. Unless I want to spend the money for someone to make a custom mounting set-up, I'm stuck with the 11" wide mufflers due to they mount to the truck AROUND the muffler, and the brackets would be too big for a 9" muffler.

I have no idea what you are talking about here....this is my 2nd ACERT CAT enigne and none of them had catalytic converters on them. And the Pittsburgh mufflers are 50 state legal EMISSIONS wise as well.

S.H.C. I am like you on the m.p.g. I document the mileage at every stop & every fill up. I know the wind, hills, weight, e.t.c. have a lot to do with the different m.p.g we get, but I want to keep track to see too what is the optimum speed,rpm to get the best m.p.g. without lugging the engine or going ridiculously slow. I also keep tabs on my m.p.g. to help me determine if anything may be needed such as time for overhead run or cac leaking. these can affect m.p.g. I had a great tailwind pushing me down i-65 last week. got 7.0 mp.g. had to recalculate 3 times to make sure I added the numbers correct. some may think different on this, but I have always put 5 lbs more air in tires than posted on sidewall. all mine show 105 psi. I put in 110 psi. none of them stay at 110 in the cold weather, they all drop over time. keep on experimenting with your m.p.g. & any other truck related info. it will be of use to someone.

That's why i've said ask your dealer. My truck is 2005, actually maid in may 2004, and engine february 2004. If it has no converters, why is such price? I'm trying to figer this thing out, let me know what did you find out....

https://dynamic.donaldson.com/webc/W...210&item=21897

Still only 10" wide, plus it's 51" long...mine is 62.5"

I asked them today and the parts guy thinks you are talking about the resonator under the cab. Some call it a convertor, and mine was $875 to replace. Mine has this resonator and then 2 mufflers on the stack, so I asked them how much louder it would be if I just bought spools and removed the mufflers, and he said maybe 20dbl? Since the convertor/resonator is the main sound deadner, so i may just go thay route too..... aparently most KW's that have the stack out the rear (like mine) such as a T600 or T2000 doesn't have mufflers, but pete's do....guess to be more costly LOL

Are you sure it will ONLY cost $100 a week? That seems a little low to me after all thats only 25 gal. I'm just wondering. You get bored doing the same thing every WEEK? I do the same 3 roads every NIGHT! I watch the pot holes age!