The head went off to Endyn for a quick valve job and then back to HyTech to be prepped for 9,000 rpm.
Since the new K20Z3 engine has balance shafts, a good deal of space needed for baffles is already occupied. To get it to all fit, Grudynski cuts down the block girdle section where the oil pump bolts down and also takes some material off the oil pump from a K20A2 or Z1, planting it on the Z3 engine. You can't use the Z3 oil pump with these modifications.
With all the mods complete, Grudynski put the engine back in the Si and went to work on attaching one of his handmade custom headers. This is HyTech's claim to fame. Made from stainless steel and his patented reversion chambers, HyTech headers are like no other on the market. To complete the exhaust is a full 3-inch setup, including a twin-loop style muffler that actually quiets things with hardly any restriction.
Anytime you have custom cams and high-compression pistons, it's a good idea to not only degree the cams, but also to check valve-to-piston clearances. The Spec 2 cam Hytech wanted to use was a little too much for the Supertech pistons and they may have hit. Without checking, it would have been big trouble.
The final part of the hardware puzzle is the intake manifold, which is the stock unit with an added twist. A '06 TSX 64mm throttle body was bolted on in place of the 60mm stock unit. Since they're both drive-by-wire, it was simple a matter of opening up the RBC intake just a bit.
Obviously all this old school hardware is incomplete without a trip to the dyno and the IT department. As part of the Spec product packages (typically header, exhaust, cams and intake), HyTech has created reflashes for the stock ECU. They're custom tailored to HyTech's products and only available through HyTech.
On the Dynapack at Church Automotive in Wilmington, Calif., this re-flash enabled James' Si to put down an incredible 260 whp in third gear. The Si proved to be a slightly underrated 197 hp and a baseline of a completely stock unit on the same dyno showed 193 whp. That means this HyTech combo gained an amazing 67 whp. Definitely power you can feel on the road
All that added power certainly didn't come cheap and the car is no longer emissions legal, but in an already lightened race car, the Silver State Classic will go by even faster.
Cams - $900
Springs/Retainers - $400
Header - $1,300
Exhaust - $1,150
Pistons - $600
Rods - $400
Since the car was going to corner in the Silver State Classic, the oil pan gets the same baffling system HyTech uses in the Grand Am Cup engines he builds. | 
To spin to 9,000 rpm and live to tell about it requires the proper valvetrain. A complete set of Supertech dual spring valvesprings with titanium retainers and black nitrided valves will go in the head. |
These are HyTech's Spec 1 cams made from new cores. Along with the header, the cams are a good part of the big power increase. They also offer Spec 2 and Spec 3 cams for engines with wilder modifications. | 
To get the baffling to fit, a switch to an '02-'06 RSX-S oil pump is required along with removing some material around the #1 journal. The RSX pump also needs some material removed. All this is because the K20Z3 has balance shafts that no other K20 did. |
This is the HyTech '06 and up Si header. For high rpm power, the primary pipes are not only stepped but pretty long. Same goes for the secondary pipes. HyTech's headers are known for their big power increases. | 
Check out the power here! On the same dyno, stock '06 Si's do about 195-200 whp. We think it's safe to say this is a pretty good improvement. |