I have found the the ta05 is very competative in it's stock form (except for TRF shocks). It is a very smooth and consistant car. Most every car at my local track is either a RDX or an X-ray and the ta05 keeps up just fine in stock rubber. The only hopups that I think it would need to be a good 19t or mod car would be the carbon tub and a small top deck.