Here is our basic run down for turbo versus power potential:
CT26 upgrade - good for stock replacment up to 250whp
Billet CT27 - good for stock replacement up to 300whp. Can be pushed to 390whp with E85/race gas and supporting mods
ATS Billet CT21 "Blackjack" - good for stock replacement up to 300whp. Can be pushed to 390 whp with E85/race gas and supporting mods
ATS "Sweet 16" - good for stock replacment on GEN4 engine up to 300whp. Can be pushed to 400whp with E85/race gas and supporting mods
TD06 - Discontinued good for 275whp - 400whp on race gas/E85
GT3071R - 275whp up to 480whp - yes it has a HUGE range and is a great choice for a turbo kit that you can put on a bone stock car at 10 psi and then add supporting mods to run higher boost later. All this and it spools only a couple hundred rpm slower than stock.
GT3076R - 275whp up to 550whp - Again, it has a huge range in power potential with minimal lag penalty.
5858 - up to 600whp
6262 - up to 700whp
6266 - up to 750whp
6766 - up to 850whp
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