A Neuspeed short pipe/filter will get you great things.
Sound,torque, and a smidge of HP.

A Chip is also a good thing.

MrNiceGuy's ride is pure quality, I did some suspension work on it back in the day and couldn't believe how well taken care of and clean it was.

If these cars are well maintained (which his is)...The'll last you a heel of a long time and require a lot less maintnance the most other makes/models out on the road.