It'll be louder but it ain't too loud. I'm running full decat no silencers from turbo to back box and it's fine. And it will probably fail emissions unless you're lucky lol. I've heard of some that don't. You jus gotta have a friendly mot guy lol.
So far so good mate. Handle fantastic n as you can c gets it nice and low. Still gt about 120mm of thread left on rear and about 40 on front still left.
Quick update on my car for ya all. It's now sitting nicely n low on shiny new coilover after my old ones decided to **** them selves and then snap a spring.