How do I know you ask? I drove SteamyZ's and SpotZ's GT2530 and the lag is bad compare to stock. I had the opportunity to drive Zhounds Z for a month TD05-16g and the spool up was very close to stock about 3200-3300 rpm. compared to our stock at ~3000 rpm. I couldn't believe how quick this spool up was and the reason why the TD05 16g are my #1 choice. Also remember that the TD05 kit comes with exhaust manifolds which is the big plus in the spool up. :)
**Dynoed at 371.2 rwhp. and 362.3 rwtrq. @ .9 bar on pumped 91 gas no time tweaking 3/11/31/03** **Dynoed at 411 rwhp. and 452 rwtq. @1.15 kg. on race gas 104 no time tweaking 3/28/03 **All numbers are SAE corrected**