Whipple LT4 pump

[Buddy B]

2018 5.3l Silverado. Has BTR Truck Norris cam, kooks long tube headers with high flowcats , magnaflow cat back exhaust, Circle D 2400-2600 stall converter. I have a Whipple 3.0 on order. My question is will this set up benefit from having an LT4 fuel system? If so will an LT4 hpfp fit underneath the Whipple? Ive read the 2.9 Whipple had fitment issues with that pump and wasn't sure if the 3.0 has the same fitment issue. Thanks

[M1ck3y]

No idea. But when you say you have high flow cats are they regular or green? If they’re regular you’ll need to get green for the power level you’re at.

Edited July 6, 2025 by M1ck3y

[Buddy B]

34 minutes ago, M1ck3y said:

No idea. But when you say you have high flow cats are they regular or green. If they’re regular you’ll need to get green for the power level your at.

My mistake they're regular not green 

[M1ck3y]

6 minutes ago, Buddy B said:

My mistake they're regular not green 

I kind of made the same mistake with my 6.2. Had to order a y with the green cats because I want to run e85.

[Buddy B]

25 minutes ago, M1ck3y said:

I kind of made the same mistake with my 6.2. Had to order a y with the green cats because I want to run e85.

I'm just running 93