With cylinder head porting there are no "one size fits all" solutions. That is why D.O.A. Racing Engines custom fits port and chamber designs specifically to each customer's application.

Cylinder heads formatted to yield the best results aren't achieved by guesswork. I offer cylinder head packages from "bare ported" to "bolt on" ready, all modified for the end user's exact combination.

Camshafts have become a big "copy cat" component these days. D.O.A. does not follow this trend. All our camshafts are custom configured, to the customer's present as well as future goals. 

There is a vast offering of pistons in the aftermarket world, same goes for rings. D.O.A. only sells those that have proven to stand the test, no exceptions. "Freestyle" guesswork combinations are not what is sold here.

I’m the only Toyota R- series engine builder offering D-port and raised port options for 20R cylinder heads. These modifications significantly improve airflow and power in classic Toyota platforms. I reshape and flow bench validate each port for consistency, delivering real performance gains for vintage or hybrid 20R/22R setups.

OEM Denso injectors were never balanced to begin with. Add years of usage and the balance rates fold dramatically, along with dripping and weak spray patterns. D.O.A. offers full clean, rebuild and balancing of any and all injectors. This really should be your first move in and under hood upgrade. 

Bore throttle bodies are a good option on a HP. gain effort. 3mm is what D.O.A. offers. On the V6's they are a bolt on and go, on 4 cylinders they must have the chamber face enlarged, or you just went backwards. Ported upper chamber, lower runners, all benefit greatly with correct port entry, exit, and volume porting

Nobody offer better intake manifold porting than D.O.A. Racing Engines, fact !!! Every engine will benefit from a CORRECTLY ported intake manifold, and this' offered on all engine packages, as well as all cylinder heads purchased.