It depends, Iam pretty shure any 5-speed tranny will benefit you. EP3 or base RSX, I heard the EP3 has longer 1st-2nd gear over the base RSX but the EP3 trans has a shorter final drive, base RSX has the shorter 1-2nd gear but longer final driver. Both are pretty cheap in my area.
Accord, Element, and TSX with 2.4 engines from 2003-2011 use OEM Honda or OEM Acupa part number: 37500-RAA-A01 CRV, Civic, and RSX from 2002-2011 use part number: 37500-PNB-003 This list is not complete, but it provides a general overview of the common engine years and crank sensor part numbers.But you need a 02-04 RSX K20A2 (Type S 6-speed) or K20A3 (5-speed Base model) Engine Harness and a few of the K24 sensors and/or plugs spliced into the harness. The ECU you have may be a good candidate for a Kpro install. You can go to hondata.com and cross reference the 3 letter code to check.After its initial launch in 2001, the K24 powerplant debuted in the Honda CR-V with the original K24A1 variation. Although Honda continues production today with the K24Y and K24Z variants, these modern-day versions aren’t going to be ideal candidates for a turbo swap. The K24’s design resembles its predecessor, the 2-liter K20. Honda Hotchkis Husky Liners Orders of $299.99 or more ship free within the continental U.S. Wiseco 88mm ArmorGlide Coated K-Series K20/K24 Pistons: 14.5:1
The different versions of the k20 head started in 2001 with the PRB-1 head casting found in the Honda Interga Type R (DC5) & Acura RSX Type S starting in 2002. The Honda Euro R Accord was also given a K20 head with the RBC casting the same as the K20z3 head.K-Tuned K-Series Tucked Engine Harness. K-Tuned Part# KTH-215-ENG K-Tuned K-Series Tucked Engine Harness. Made using SAE certified automotive grade wiring. The military grade shrink loom is rated for - 67°F to 320°F. For most K-Swap Cars, 02-04 RSX Type S, RSX Base or EP3 with Type S or K24 Swap using a K-Tuned Adapter Conversion Harness.