Congrats bro!! She'll surely put a smile on ur face each time u floor it. First thing first, suggest u to change all oil n fluid. just in case
Valvetronic exhaust is purely up to u bro. Yes it does bring the garang sound at a push of a button, making ur ride more pronounced. I dont see why not. Pretty safe mod. Lost of ppl have done it. Dont think it wld add any horses tho. If u live in a condo complex, the valvetronic surely helps not to wake up the neighbors in the morning hehehe.....
Remapping depends on how aggressive u want it to be. Suggest u go for a map that is within tolerance, so u wont be getting those pesky check-engine-light (CEL) warning. A 'safe' mapping would get u up to 20% more HP, with a max of 30% torque. ur ride is already a 300hp/400 torque car. If u want to go much more aggressive, hardware also needs to be changed/upgraded (DP, intercooler, intake, recommended to change brakes, etc.). Have to put more into maintenance.
If i were u, i'd remap first, then only exhaust... hehehe
Thank you bro Gen for the wonderful tips and advise. Think to remap so can gain hp and tork. Anyhow, does it harm the engine after the remap process?
Can you recommend any shop can get safe remap done? I believe yours ady done right? Thank you sifu