Ummm. No. How will it sound better if you just take off the exhaust for one??
It sounds a lot better with the racing exhaust than the stockie. The wing + sports suspension is more than enough for it as it just grips the road through the first 4 gears which is where 70% of the track is set up. I came 2nd in a little GT4 comp (under $20k with mods) with this car on another site before I joined GTP. I still have it in my 1st MC garage today.
And even with the mods on there, it's choked up top, so removing the exhaust will only choke the top end even more and the flywheel needed to keep it spinning otherwise the stock gearbox and hard breathing holds it back.
Add some nitrous for emergency use (spinouts) and you've got a nice 'ring attack car.