Fuel return

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The trouble with the Walbro 400 or 450 upgrade is that it entails removing the internal fuel filter of the pump module, therefore having to add an external filter. This about doubles the fuel system plumbing work to be done, and is overkill for the stock engine.

Personally I would not do it unless I already ran out of fuel with the Aeromotive 340, or had pending plans to outrun that pump within the next year. There is a lot of work and money saved by using the S1 or S1-S system with a stock filter and an Aeromotive pump.

For the Stillen SC we automatically recommend the S1-S as that is the main reason that system was originally built. The S1 and fuel systems like it clutter up the fuel fitting area at the front of the passenger valvecover (the factory fuel rail inlet tube fitting) where its already very tight with the Stillen SC system.

The S1-S uses the CJM rails with proprietary plumbing that eliminates the stock rail inlet tube. The S1-S upgrades everything in the bay and connects to the factory feed-pipe that routes from the fuel tank to the engine bay. The fuel lines for the rails come in from behind the motor, somewhat "shaving" the fuel system in the bay and reducing clutter by the Stillen SC throttles rather than adding to it.

The S1 system uses the stock rails and inlet tube, just upgrades the hose from the feed-pipe to the rail inlet tube, and includes the billet multi-fitting to splice off for the fuel return and regulator.

The S1-S is much easier to upgrade down the road as it already includes the billet rails and many parts from our S2-SE system, which is our external filter kit with upgraded undercar feed pipe for use with the Walbro 400/450 pumps.

I would personally recommend the S1-S for your application due to improved fit with the Stillen SC, and how it already has most of the S2-SE system should you decide to switch to the Walbro 400 or 450 pump (only needing to purchased the additional S2 parts to upgrade it, with almost nothing going to waste)

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