The OE DP is a twinpipe, an uprated DP will be one large single pipe but if this is a Milltek twin-cat that you have, it's unlikely that the DP will be an uprated one.
Your cat-back sounds fine so I'd leave it if you are happy with it. Can't get much more free flowing than that and sounds like a Custom jobby already
Awesome GTi are a distributer for PipeWerx. PipeWerx are an exhaust fabricator much like Blueflame who specialise in motorcycles, high performance, prestige and classic cars.
Cold air feed can be done properly for under £20
Your cat-back sounds fine so I'd leave it if you are happy with it. Can't get much more free flowing than that and sounds like a Custom jobby already
Awesome GTi are a distributer for PipeWerx. PipeWerx are an exhaust fabricator much like Blueflame who specialise in motorcycles, high performance, prestige and classic cars.
Cold air feed can be done properly for under £20