I've got these slp runners sitting by my feet, trying to decide if I want to sell them or not. I don't know if I'd benefit more putting them on my motor, or selling them for $250 bucks I opened them, expecting to install them, but they've just sat here. I even trimmed the gaskets to the correct size for the runners and opened the hex tool and bolts that come with them for a test fit. They've got a hole for the cold start valve, but I was going to block it off since I don't have one anyway. I'd love to stick them on and compare times with the stock runners.

For those of you that haven't seen my car, it's an 87 iroc with a 4000 mile old L98 with an LT4 cam, edelbrock intake, ported aluminum L98 heads, edelbrock coated headers, borla cat-back, and other little things. I don't know if I can justify the minimal gains I'd see(or otherwise?) for giving up the money. Let me know what you think.

 

You're already running an aftermarket intake and ported heads. No point in opening up the heads and intake only to make the motor breathe thru a straw.

I'd put on the SLP runners and port the plenum to finish it off.

 

Well, it's done. Put my lcas and panhard rod on today and ported the plenum and matched it to the runners. I was pleased to see that my edelbrock intake ports were the same size as the slp runners, and my plenum ports matched fine but needed a little enlarging. Can't wait to see what difference I feel after I put it together tomorrow.