We have often wondered and been asked if porting in addition to the radius rod addition would improve the LS3 intake manifold. We figured it would be a great time to find out – so Mike and Ryan quickly built 2 manifolds, one with just rods and the other with the stands removed and ported. Both we and our customers have tested the radius rods on chassis dynos and at the track many times and usually see from 6 to as much as 12 RWHP. We saw 11HP at 6600.
The ported version looked quite a bit better. We were disappointed with the positive result as the porting is very labor intensive and it’s probably going to be requested a lot going forward. Although we didn’t find significantly more peak power, but we got it everywhere and the midrange torque increase was worth the effort.
1) Mod My Manifold.
The “Mod My Manifold” option allows you to send in your LS3 / L99 Intake Manifold in to us (shipping instructions below) to have the modifications completed. This option is best for the individual who doesn’t use their car as a daily driver, or can stand for the car to sit for a short period of time – while we are modifying your manifold. This is the least expensive option. Typical turn time is around 2 weeks.
2) Buy Modded Manifold.
The “Buy Modded Manifold” option is our most popular option – because it doesn’t require any downtime at all. We send you one of our modified manifolds from inventory.
We will optionally buy your stock LS3 manifold back for $350. Just send yours back in the box you received yours in. It’s that easy! When we receive yours (and verify it is not damaged…) you receive your core refund back.
If you decide to ship us your stock manifold back for the $350 credit – pack up and ship your intake manifold to:
1301 T P White Dr
Jacksonville, AR 72076
Please include a copy of your invoice in the box with your manifold.
Please remove all vacuum hoses and sensors from manifold before shipping.
We HIGHLY recommend using generous amounts of shipping peanuts / bubble wrap. We’ve had a few “less than cautious” packing jobs (thrown in a box and taped up) which led to manifolds getting damaged in shipping. Unfortunately we are unable to issue core refunds on broken / damaged manifolds.