7M-GTE 230hp HKS: max 450hp 3 liters + turbo = lots of power to be unleashed! Beyond about 350hp turbo upgrade is A Good Idea. Many people have achieved 550-650hp while keeping it streetable. But do retorque the head gasket! 90% of problems with these engines come down to the head gaskets, which blow because the head bolt tension is too low. See supras.com for more info. 7M-GE 200hp HKS: max 218hp Trade it for a 7M-GTE Supra turbo ;) Unless you're satisfied with around 250-260hp, which is as high as you'll get with 7M-GE. 5M-GE 160hp HKS: max 174hp Not too many performance parts are available. The Celica Supra was tried in rallying but abandoned quickly (even the Celica was heavier than regulations required even after extensive lightening of all possible parts). Consider putting in a 7M-GTE instead, as several people have successfully done. 3S-GTE 200hp HKS: max 283hp Your wallet puts the limits on what you can get out of this engine ;) Performance parts are available but may be expensive beyond a certain level.Still used in world championship level rallying in the Celica GT-4. The stock turbo should be upgraded or modified for over ~250hp. The stock intercoolers aren't that effective, especially the 87-89 GT-4 unit is poor. After these have been attended, 350hp should be possible. 5S-FE 130hp HKS: max 144hp Not designed nor used for serious racing. Air filter, exhaust and ignition are all you're going to find for this one. 4A-GZE 145hp HKS: max 186hp Larger pulley for the supercharger will raise the boost. The bottom end is much stronger than the 4A-GE, therefore a few people have turbocharged it with good results. 4A-GE 112hp HKS: max 168hp Maybe THE most popular Toyota engine used in racing. Think of any part for it, and you can be sure it does already exist! The European spec engines (-1990) had no cats and higher compression ratio,so they produced 122-125hp. The TVIS system was dropped and hp went up to 130, and later VVT was added with noticable power increase to 160 without loss of low end torque. The old versions are still very much used in national level rallying (Corolla GT), and Toyota Atlantic series. The VVT version is so far only available in Japan. The earliest (up to late 87 or so) 4A-GE stock bottom end is only good for about 160-180hp. Stock fuel system is good for 150-160hp. Over 200hp is possible, but expensive. 3S-GE 115hp HKS: max 126hp Later versions of 3S-GE are MUCH more powerful, up to 175-180hp for 1993-1996 models. BTCC (and other 2.0l touring car classes) versions have around 300hp@8500rpm. 4K 58-65hp Nothing in its design suggests that it could be used for racing, but it has been! That's due to it being put into such ultra-light car as Starlet. Still, you can get 100hp out of it which makes a 700kg pocket rocket. With 5K block close to 1500cc. 2JZ-GE 225hp Buy the turbocharged version, or get a turbo kit + lower comp forged pistons. 2JZ-GTE 320hp What, you need more? ;) If you could afford one, you probably can also afford upgrading it to 600-700hp as many shops will be happy to do... This engine is superior to 7M-GTE because of its ability to rev higher reliably (fully balanced crankshaft = 12 counterweights). Comes stock with metal head gasket so that problem was addressed already by Toyota. Engines not widely imported to US: 2T/2T-B/3T/3T-E 75-105hp Despite being pushrod engines, these have potential for some 150hp naturally aspirated. Can be bored to 89-90mm, which with 3T crank yields close to 2 liters! Turbocharging is also somewhat popular for street (up to 200hp), but the more serious ones use one of the twin cam versions instead of these. 2T-G* 110-125hp Same comments as above, but these are twin cam versions. If you don't know how to distinguish a twin cam Toyota engine by its code, here's the guide. 3T-GTE 160hp Racing versions (4T-GT) were used in Group B rallying and Group C, but weren't available for too many private teams. The strongest block, crank (8 counterweights, rumours say it would be forged as well) and rods of the T series. Lacks intercooler and blow-off valve in stock form, these should be first in the list of upgrades along with boost controller. The stock CT20 turbo is worth its weight in junk iron, and should be replaced if you want reliability and/or over 210hp or so. At this point, also an injector upgrade is in order. I have modified mine up to firstname.lastname@example.org, limited by the 50-trim T3 turbo. With a more suitable compressor side and more aggressive cams, 350+hp should be no problem. 18R-G* 120-145hp 290hp has been squeezed with turbocharging for street use, or some 180-200hp naturally aspirated. 1G-GE 140-150hp 1G-GZE 160-168hp 1G-GTE 185-210hp Any of these three engines would be fine for a street car if you're satisfied with stock output or a modest increase to some 260hp for the 1G-GTE. None of these have been used for racing.