how much HP/porting and polishing stock intake

PM TMOSS, he does that stuff.. I did it myself (lower only) and I feel I picked up a couple hundred extra RPM up top with no loss down low, if I had to guess I would say I picked up the standard 5 - 10... I'm sure TMOSS could get you more... OH, on a side note, I'm never going to do it again, just too time intensive and with 1 fulltime job, one partime, full time school and 1 wife, it just wasn't worth it...

For the mods you have it would fit in nicely...its cheap money for Tmoss to do a lower up....Youll see a nice little hit in the mid range...and it'll pull way harder to redline....the stock unported lower is signing off around 4800 or so, and you can feel that...a ported lower and it'll pull to 5800 no sweat...There's quite a difference as I been there and done that...120.00 shipped or so to get it done by Tom..if you don't have an intake upgrade in your future...a ported lower is a step up to me...
Your got a CAI set-up??? more air the better and it'll help along with the ported lower...

Here is my stocker that Tom did up....I gasket matched and cleaned up the ports, both U/L...He does some cutting and welding at the front #1 and 5 runners to "flow" better...

I had Tmoss port my stocker and that thing was a great. You can tell the diff. in the fact it rev'd faster and pulled harder over the 4,500-4,800 stock limit. Awsome bang for the buck.

I used a dremel and I used ALL their attachments. For a template I used a metal gasket from a 3/4" phenolic spacer I had lying around. My dremel came with a router attachment which I carefully lined up to the gasket. I took approx. 3mm out the entire way around. I sanded and smoothed and straightened the runners as much as I could and hogged them out the same 3mm throughout the runner length. I did not touch the upper intake and I still felt gains. I'm going to the dyno sometime this summer and we'll see if my butt dyno concurs with a real one. The best advice I can give you is prolly what everyone else here mirrors, too big is definately a bad thing when porting. Thats why I used the spacer, I didn't want to take too much material away and a). loose velocity, and or b). take away too much material and punch through a wall. Unless you feel really comfortable doing this, and can buy another intake if you screw it up, I wouldn't recommend it. Took me approx. 5 nights to cut it all away and smooth it all up. You could also try to use a caliper to gauge the thickness of the walls, I didn't, thats why I was so careful not to take too much material out...

Hey, FWIW, I used my electric drill and a rotary rasp 5-8451, then finished with a cartridge roll on my 4-banger DD. It's a great method if you don't have to get too deep into the port, say, 40mm or so, and the removal rate is just about right for me. I'm planning to use the same technique this winter on my GT40 lower. A high speed air chuck would be better, but then again, I like the electric drill better than the dremel for this. Props to grrrrrr for having the patience

Your welcome for the info, not sure how much I helped... Good luck with it. I think if I had more free time on my hands I might have had a different outlook on it in the end. Just make sure you wear goggles, sweat and metal slivers and eyes do NOT mix...


Thanks for the props touring, I've never really been a patient guy, but after being married I had to learn a LOT of patience... the juries still out on whether it's worth it though...

My website has an illustrated porting guide..........see the link in my sig.....