Hi

I have a full decat 3 " japspeed system on my v4 sti type r, and wanting to put a track friendly backbox on it and was wondering if i could just swap the backbox or if i would have to swap the whole exhaust?

I am also guessing i would have to get it remapped after swapping it?

Any advice would be great

 

I'm using a Fujitsubo gikken one piece pipe on my decatted classic. It passes Brands hatch 105db noise tests at around 96db. The trick to keeping a decatted system quiet is to use a resonated centre pipe. Ive been told that a map tweak isnt essential but I dont understand how changing the flow of the exhaust gasses doesnt effect the combustion so I would reccomend a map tweak

 

Castle Combe is 100db so be carefull, I have a decatted TSL system on my V3 and a resonator as mentioned above in the middle section and is is always 93 / 4 db.

 

Revolution 3" Track friendly system.

 

Noticed quite a few people reccomend TSL, are they still going as there website is dormant and ebay shop closed??