Save yourself a grand and buy a drill...
Failing that get a Milltek non resonated and buy your neighbours some earplugs for when you get home from MaccyD's at 2am.
I saw a MK4 Golf on Sunday with a massive double exhaust that stuck out miles and was as loud as anything. It was also sitting on its bumpstops and had cotton reels for wheels. I wish I took a pic of it!
That was just before I was overtaken by two mk5's within about ten minutes of each other. One a black GTI overtook me on a blind bend in a 30 limit then did an illegal right turn into a 'buses only' slip road.
The next was a red TDI GTI wannabe that overtook myself then another car in a 30 limit before cutting in to turn left - at a red traffic light so he had to stop anyway? What the flying f##k?
I hope I wasn't quite that stupid when I was young. Mind you with my luck, if I'd taken my tw@t pills and did something like that, knowing my luck, the only police traffic car within 30 miles would be parked up right in view!

Are sporty Golfs turning into chav mobiles?
Am I getting too old for all this?
Anyway, Milltek Non Res. good quality, British, good reputation....