Thanks. As it's the noise I'm interested in, then maybe it's best to forget that idea then. When I had a Noble and Esprit V8 I had them fitted and I used to deliberately slow my gear changes down just to hear the noise.
If you're not looking for outright power, I'd go for Y pipe, intakes and injectors. That'll net you around 600bhp and will make the car come alive. Litchfield Stage 3 is what you're looking at. You can add an exhaust to change the note, and that takes you to Stage 4 territory and around 620bhp, give or take.
a good stage 1 gives best bang for bucks and should gain around 100bhp
you will feel the difference and will sound a lot better aswell
filters,y pipe and remap
get the parts used and should be well under £1000