I assume you mean the AWIC? I loved it, there is no sacrifice with it in my opinion. It would start to heat soak after 3 hot laps. 10 mins sitting with the pump and fans running (heat exchanger had it's own fans) it would be cool to the touch again. On really hard mountain runs, it might get a little warm after 15-20 mins, if it was a tight technical road. It's a cheap frozenboost.com cooler with a Bosch pump and frozenboost 24x2x7 exchanger. A reservoir would make it stay cool much longer, but I haven't added that yet. Also, a high quality would help also, as the frozenboost intercoolers don't transfer heat as well.
My car is a coupe also, sunroof car with power everything and dynamat everywhere, including the roof and trunk. It had a stock 2.5 w/Wiseco pistons, 2-piece intake, 52mm TB, ported stock exh mani, stock Garrett T2 turbo with a big can wastegate (made that, drilled the spot welds off a T1 log can and screwed it to a T2 can bracket), 3" exhaust, +40 injectors and GM 3-bar map. I think it would have went faster, I spent the first year with it at the drag strip running up to 25psi and tuning fuel and spark. Didn't run the track at all next 3 years, just did rolls on the street on weekends, but I started playing with less boost and more timing and it got a bit faster. 6.1 SRT and 09-up 5.7 RT cars couldn't pull much till after 80mph, by 100-120 mph the stock head 2.5 was done and the V8's were just getting rolling lol. 3.77 geared 568 made it a beast from a 2nd gear 35 roll up to 70-80 though
Mountain runs were fun too. I made a (then brand new) '14 Civic SI fade his brakes going uphill trying to keep up...and, if I drove it super easy, I could get 34mpg driving back and forth to work (part town, part country driving).