Which back box?
 

Hi All,

I'm sure this question has been asked before but I've search the forums and can't find anything useful.

I currently have 2 blobs, a WRX (290bhp) as my daily and an STi (400+bhp) as a weekender. I'm looking for advice on which back box to use on the latter.

Both cars have a Hayward & Scott 3" de-cat system with the WRX using a 3" new age with larger silencer and the STi using a 4.5" Jap style angled back box. The WRX sounds awesome and the STi looks great but is WAY too load. I guess I could add in an additional mid silencer, although would prefer not to.

Soooo, on to the question; what recommendations do people have for something that has the Jap look but won't deafen my neighbors?

https://cimg5.ibsrv.net/gimg/www.sco...fef339c0ea.jpg

HKS silent hi power? Or perhaps a Prodrive rear silencer? When the prodrive box is mated to a de-res centre and a prodrive or decat downpipe, it's just right for daily drivers. Still rumbles, but its not droney or prone to upsetting the neighbours.

https://cimg4.ibsrv.net/gimg/www.sco...d360f1cb63.jpg
I think the only way you'll have the freedom of.choice over look, and sound is to go custom.

Thanks for the advice! I'll take a look at the HKS system although I think that uses a mid pipe silencer so would need to replace the system.
Custom may be a good option! :-)

exhaust
 

Here a quick link to my custom 3" turbo back exhaust. Straight pipe non resonated. 4" jap style tailpipe.

Car was running and upto temp.

exhaust
 

Full decat. 3" turbo back to a 4" jap style tailpipe. Was mapped immediately after by Andy Forrest. Also de resonated with a cosworth hi flow induction kit. Sounds superb on boost. Slight misfire due to turbosmart dump valve, which is always set to full recirc but still a slight vent. This was also mapped in.

perhaps even consider an afterburner vortex from Scoobyworld. Nice deep tone, jap look, but actually not deafeningly loud. Had one on my old blob wagon.