2015 sti exhaust
 

I've bought new exhaust

Started with boxes and centre pipe

Then did one if the cat pipes

Now looking to get the other cat done so will be full de cat

How much louder do you think that last cat will make?

It's hayward and Scott exhaust

Cheers!

I have hayward and scott full system, japspeed downpipe, decat, on my hatch,sounds like an impreza should, an earthquake

hi
 

lol

so will taking that extra cat out make it louder?

also its a 2.5" system, is 3" louder?

many thx

I would think so, mines a 3" system and sounds good not an annoying drone noise just a nice rumble

i dont need an mot for 3 years

but what do you do when an mot due, just take to a friendly garage?

That's when the problems come, I had to get a 200 cell sports cat welded into my japspeed downpipe, noise is the same and power is the same, I'll get a remap soon but fancy front mount intercooler so will wait, it only just passed mot and i left it in intelligent mode

ok cool thx

I have a 100 cell sports cat, better flow than a 200 cell sports cat, but you need it boiling hot before mot to get it to pass.

Quick question all? When you ran 2nd decat only did your 2015 Sti need a remap? Did you get the engine light on?
Thinking of removing only one cat to keep it mot legal.

Any advice appreciated