If i have a T1R 70mm single tip exhaust and want to add the Js Racing rear diffuser what would i have to mod?

i heard that i might need to cut some of the diffuser because the piping will hit the diffuser

and i also heard that i might have to modify the bracket, anyone have experience with this combo?

all comments/advice would be appreciated

 

I dont have any experience with the combo that you specify, but i do have an ings rear bumper and top secret diffusor. To make them fit, both the bumper and the diffusor had to be cut and some custom brackets fabricated. Its just up to you if you want to cut up and expensive JDM part - you have to know that you cannot put the pieces back in when you sell - and it will probably affect resale value

 

You have to modify the bracket which holds the diffuser to the chassis and thats pretty much it.