Currently have mrev with xo2 full exhuast. I love the set up and am now itching for a modest gain(10 or so Hp). I was thinking of adding the Iso upperplenum but hear you lose torque without tune. Wanted hfc but hear you lose without tune. Problem is I cannot afford the Osiris 600 buck tune. If I addthe components mentioned without tune will I really lose power. Not interested in trading the mid range bite for up high power.get the drift? So confused.

 

I have full bolt ons except headers and am not tuned atm. Car still runs fine.

 

Songle 6mt 05 just like me. That's what's up. So can you walk me through how the car performed after each one? Do you have the mrev?