Fuel mileage? That's all how you use your right foot. Exhaust will give you sound.
Stock exhaust 5.3 is 2.75" diameter piping.
If the truck is nice and worth putting some $$ into it, I'd go for a Corsa catback. I had one on my 2019 old body 5.3 and it was just perfect. Zero drone, just driving around and cruising on the highway you'd think it was stock, but when you opened it up it was like a Camaro with the factory dual mode. Corsa bumps their catback to 3in diameter.
First brands was the holding company that owned Champion Labs and Fram, + many other auto parts companies. Those brands are not making filters anymore.
Premium Guard Inc. (PGI) acquired the intellectual property for both FRAM and Champion Labs. Premium Guard is a similar company as Champion Labs was.
🤷♂️
My info is right from stuff we got from GM for the "A" and "B" and what they replace based on the old Duraguard (blue non "R" filters) and Ultraguard Gold (black "UPFXXR" filters) which are now gone as a result of the First Brands issue.
So far they are all ones "not to stay away from"? I haven't cut any open yet though to compare A and B style.
As for what they replace:
B = regular "blue" Duraguard
A = The "black" Ultraguard Gold. So like UPF63R is now the PF63A.
C = That I can tell, alternate supplier or same supplier but alternate model being used.
Right now on like PF63 for example though, the "B" is on backorder again so we are using the "A" for both PF63 and UPF63R usage. Same with PF64s, the B is backordered, so we are using A.
PF66, the most recent case we got were actually from SAIC-GM from China (GM ETurbo engines so 1.0, 1.2 and 1.3 turbo 3 cylinder). They look like engine assembly plant filters to me which even for US products have different labeling on the cans. These ones are blue with the SAIC-GM logo on them.
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