Exhaust Parts

[corollasr]

hi all,

lately my exhaust has been making weird noises on deceleration, like an odd booming. the garage i bought it from say its just a valve in the manifold that is running weird. i'm not particularly worried about it but i am going to be buying a full system from the manifold when i change my insurance. i already have a price from the cat back, but how much will an uprated manifold and decat set me back

any help appreciated

cheers

ed