Okay I got a h22 eg hatch turbo running s300 ive already got car tunned but over the winter I decided to do some upgrades I put two and a half inch intercooler piping cause in 2 spots I had only 2" piping. Also had to make a new downpipe cause old one cracked and I was gonna run skunk2 70mm throttle body but when I called to make an apt I found out that dentsport is no longer in business closing down... my question is will I need a retune with half inch bigger intercooler piping and a new downpipe same size

 

You should be safe with those upgrades! As long as you are not adding boost or fuel or enlarging/changing the exhaust velocity/flow it will run of your previous tune.

 

Okay great thanks for the quick response ...now if I installed my throttle body would that change my exhaust velocity I'm assuming more Air in more air out would I need to retune if I installed my TB..I just found out dentsport is going to be open till the end of the month soo I would have time to schedule a retune if needed im butthurt there closing down matt and all the guys at dentsport are great people hopefully they move on to bigger and better