Looking to get into SCCA solo racing / track days with my 90 SI hatch. It is a nice ride for the street with cold a/c and a good ride with the Tein S tech springs and tokico illumina struts. But it could use some improvements here and there. My last hatch was a 91 civic DX with a B20B swapped in with a nice list of bolt ons and some spray. It was a blast and I miss the speed and power, I will eventually be building an engine for this one but for now I just wanna play with what it has. I am looking for some more power to start and was wondering where the largest gains on this engine can be found. I know everyone will say I, H, E... But I was to know what makes the largest improvement. Is a cam worth the money? What intake manifold works best but isnt 500 bones? what intake should I look into? I plan to relocate my battery to the back of the car to clearance there will be more open. there a style of header this engine likes over another? such as 4-1 or a GOOD 4-2-1 or something like a "tri y" ? I more less have my mind set on the Buddy Club Spec II as I heard a friends car with it and a B series and fell in love. I will be keeping my cat under the car but am not opposed to a higher flowing cat replacement. I still have my complete ZEX wet nitrous kit I will be putting on and I currently have it jetted for a 45 shot which I think is plenty safe. I have more jets to raise and lower power if wanted or needed, but i think a 45 with this lower powered engine will keep wheel spin from a corner to a straight to a minimum. Is there a specific cam I should look into for the N20? I am wanting to purchase the Hondata S300 for tuning reasons of the eventual engine swap and also once i got all the bolt ons on the current engine to tune it and maximize performance. For the N20 I plan to upgrade my fuel pump to a walbro 255 unit as to keep it properly fueled while spraying and keep from going lean. The engine is ALLEGEDLY all stock with the exception of a ported and polished head... I have no idea, I will bet on all stock. it looks 100% un molested. I believe it to be original to the car, the car has 213,xxx miles but runs PERFECT! And does not leak any oil, does not burn but a quart every 3k miles. I run Castrol Edge 10w30 in the goldish bottle (one that has some titanium properties or some jazz... it is their top of the line basically.) I change my oil right at or a little before 3k miles with a good quality wix oil filter and let it get a nice and long drain. I recently replaced the timing belt that looked original after it popped on the way to work while there I also did all the other preventative things such as tensioner and water pump. I have a new clutch that will need to go in first and will be ordering a lightweight fly wheel to help increase the rev speed and response. So what say yall?