How much difference will having a ported and polished DC2 intake manifold make, compared to something like a Skunk 2 Pro one, having had my head port and polished? Is it worth it?
I have a 65mm J's Racing TB.....
I would go with the JG Edelbrock Performer X. It's consistently shown better gains for those with milder mods. Or better yet.... DC2-R intake manifold.
I wouldn't consider going the pro-series stuff unless you've got a healthy bump in compression/cams/displacement and a ported head..or any combination of the listed.
Don't bother with the intake manifold till you go 1800cc then.
If that's a good deal to you, then there are some performance benefits to it...as long as you tune properly. Otherwise just slapping it on with the stock ECU will generally produce LOSSES up until 8000rpm
I'm all up for building the shi! outta things but I would rather save the money for the time being, especially if you got bigger and better planned down the line.