which rear box do i ned to get that famous scooby burble . at the mo have magnex decat down pipe and centre section and unkown rear box but not the sound

 

Go for the firestorm from TSL.

simb

 

Blitz if you want noise & burble!

 

Hayward & Scott 3.5", understated, but loooooovely bob-bob-bob-bob...

 

Magnex 6X4 Oval....nice quiet deep burble but noise takes off above 4000 RPM

 

Hayward and Scott Scoobysport has a lovely sound if you don't like it too loud. I've also had a Ninja, which also has an addictive flat four burble and a big 5" shiney look to the tail pipe...and not too loud.
Or you can go afterburner Vortex......Louder but very yummy!