as per question,especially compared to a prodrive wr exhaust,in particular the group n bb-i have heard the firestorm is too loud
martin

 

Grp N with just a centre and rear is perfect IMHO. Not too loud, but sounds v. torquey under WOT. My other scooby owning friends also think it sounds fantastic, and I take the 'tunnel' route home every night

Firestorm is too loud for me.

 

Sorry to hijack but how did you find the quality as I have just ordered a scoobysport BB which looks fantastic which will be fitted to my other halfs 03 WRX. But I have not made up my mind as to what to fit to my STi 8, TSL Group N or another Scoobysport.

 

Go Japanese and get a HKS Hiper or Blitz Nur Spec

Most superior quality i have ever seen

 

Im with BL on this

 

Except of course he wants a BB that leaves his hearing intact. Which sort of gets rid of both of those suggestions. Not the Drager, which is a made better than the Hiper & Blitz (being 'top of the range'), offers pretty good flow, but no headache.

Alternatively, there's the ScoobySport, TSL, Magnex, Hayward & Scott et al. which are all excellent quality, although maybe the finish isn't as 'polished' that means nothing about the actual quality.

Now, IMHO ,
TSL 'group N' is a very nice backbox. Doesn't drone, sounds great under power - has the slight 'splattery' sound that the rally cars do rather than the drone that the, ahem, 'desirable' road cars do. Won't get any complaints from anyone noise-level wise, but is a great noise-toy too

 

looks like a tsl bb for me when i get the sti then,now to decide on the colour
martin

 

You won't be dissapointed. the only difference in quality is the welds, but lets face it you cant see them anyway!!!

In terms of sounds and looks, I cant reccommend the 4" grp n highly enough.