Managed to have a custom 60 mm stainless steel cat-back exhaust system done, and a remap. Painted the rear bumper, side skirts, and polished a bit all the scuffs on the rims. Changed the filters and put some Abarth spec'd Motul 10W50.
I've kept the "stock" exhaust configuration, with a mid muffler and a baffled rear one, as I don't want it to be too loud. I'm looking for the stock Abarth Grande Punto experience
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The stock configuration was producing 150 hp and 243 N/m of torque. The remap changed the whole car, now it's producing 183 hp and 296 N/m of torque on 100 octane fuel. The acceleration curve is a lot more linear, the car is running a lot smoother, and the fuel consumption went down quite a bit. It's quite fast and rowdy now without being too obnoxious. Now I'm running 102 octane fuel as a test, a bit expensive, I reckon it's adding 2-3 hp max, but the throttle response seems a bit more tight.
Now I just need some Bilstein B6 shocks, new front brake calipers, EBC Yellowstuff pads and rear trailing arm bushings, and this hot hatch is pretty much done.