OK. I am a new buyer of an SDR.
First thing I want to do is change the exhaust to a more purposeful system. SDs have come on a bit, since my original 2005 model.

I quite fancy the FMF cans. Do they come with an adjusting Y piece?

Being in the UK. Would it be advantagous to get an airbox mod as well.(seen as how dealers will normally fire in an Akro/rich map).

I don't want to go all finite with SAS/O2/PC3/Flies?

Just want Air and extraction.

Any simple advice?