Low 15's is pretty poor.
I went to the off street drags a few weeks back and a stock Corolla turbo was running mid 15's!
There were no new Celica's there but heaps of old ones (TA22, TA23 etc..) with all sorts of engines. There was a 3S-GTE, 4A-GZE and a guy with a 308 V8 running nitrous!! It was the strangest sounding Celica I had ever seen! Can't remember what sort of times they were running, none were overly impressive.
The most impressive performance was a stock looking Lancer GSR which ran 11.0. There was also a Pac Performance RX3 which ran 8.8, wheelstanding through 1st and 2nd gear - pretty amazing to watch.
There was also a Cressida Grande with a 1JZ-GTE 2.5 litre straight six twin turbo conversion. Very classy, can't remember it's times.