I pretty much agree with Hook, except for the downpipe.
I went for all the hoop-la with the gains going with aftermarket downpipe vs stock, stock is oval shaped, very close to the same total circumference as aftermarket, not enough to make any difference.
Absolutely no changes with anything not even EGT’s, only changes was lighting up my wallet and taking up to a half day installing.
Straight pipe is kool but after a while the excessive drone and exhaust stink will get annoying to most.
There’s been a few that has put the stock cat/doc back on after straight piping so they can breathe and talk in a normal voice to other people in the cab.
A few threads recently people wanting to know if a aftermarket cat will help, NO IT WON’T,
I’ve already tried this.
Me included after 5 years of annoying drone and exhaust stink, first installed the FTE resonator/muffler on to tone down the drone then eventually had to put my stock front pipe with cat back on to tone down the exhaust stink, no power loss or EGT changes.
I found that the stock muffler and DPF (you don’t have) are the most restrictive.
Anyone that claims they don’t notice any differences they have to
: something or
or even both, at least while they’re driving.
I’ve come to a conclusion over the years when people make all these awesome gain claims on stuff they just want others to be foolish enough to spend the time and money like they did.
If you leave the stock downpipe and cat then go straight exhaust catback you won’t have to worry about having a muffler.
IMO with my experiences only replace the downpipe if your is having issues like exhaust leaks.