My lsj won’t boost at all. Just recently changed the maf and the codes went away for that but I’m still getting a p0420. I have new long tube headers, high flow cat, and resonator the rest is straight back 3”. I have a homemade intake tube but it’s all sealed and no leaks. Working on getting a zzp 3” intake. But I don’t think that’s the issue since it’s sealed with no leaks. All my lines are solid none of them are dry rotting.. my boost gague doesn’t work either. When I bought it the supercharger whined like a bitch and now nothing. I’ve been reading a lot just a lot of different answers. Not sure what to do any help would be very appreciated.

 

Pretty sure that’s a catalyst out of range code. It’s likely just because of your high flow cat. I believe it’s the secondary so it shouldn’t effect performance. You can tune it out.

if your maf codes come back it’s probably because of the home made intake. That can usually be tuned out unless it’s causing allot of turbulence at the maf.
is it a bigger diameter intake tube you made?

 

I know this sounds like a stupid question, but did you accidentally swap the map and baro plugs? They are close to one another, and it's easy to accidentally swap the plugs, and if I recall correctly it won't set a code if they're swapped.