Punto tjet exhaust system

[louboy123]

I have a tjet punto ive had it remapped to 155bhp now am getting a full stainless steal cat back custom exhaust will it make much of differance for bhp and torque ?

 

[scoop987]

Not that much, not sure it will even be noticeable, but torque band will come lower down the rev range due to lower backpressure in the exhaust system (which causes the turbo to spool easier and faster). To be honest though, you should have had the exhaust done first then remapped it so you can reap most out of the modification