TSL Group N to a Ninja???
 

I have a chance to change my tsl group n back box for a ninja, as i want something a bit louder. I was originally looking at the afterburner vortex/ blitz. Somebody has said to me, if anything the ninja may be a bit quieter than the TSL. Anyone done it?, its on an 06 STi by the way.

Never heard a Grp N but the Ninja is regarded as middle of the road in noise stakes, which i assume would be true of the Grp N???

Agree to the above.

The Ninja was too quiet for me also, even after non res centre and decat centre so I swapped it for the Vortex and was happy.

Go for the Blitz Nur Spec R mate... you won't regret it!
Never heard the TSL one, but have heard some sound clips of the ninja, and with feedback on it before I went for my exhaust, it won't satisfy your desire for LOUD :D
The Vortex is loud... but the Nur Spec is louder and the rumble is much deeper.