Available now on our online store is this Xcessive Manufacturing 13B-REW Lower Intake Manifold and 4 Port Secondary Fuel Rail kit.
After more power and better flow for your street 13B? Then we recomend changing your stock lower intake manifold. Xcessive have maintained the smaller primary and larger secondary runner design to keep a bit more mid range then 4 large runners, but still be able to handle much higher numbers.
From the Xcessive Manufacturing website -
13B-REW Lower Intake Manifold
"For best results, port matching is recommended, but the manifold can be bolted on for better perfomance without any work. We've designed the ports to only require blending in to the runners about 1" for port matching so it doesn't take any expensive porting tools, just more common burs and sanding rolls. We've also casst the main lower flange with pads to aid in the addition of Semi-P Ports.
The manifold can still utilize the stock side feed fuel rail with some clearance work, but aftermarket top feed rails for 2 injectors or 4 injecotrs top feed rails are a direct fit. If your planning on upgrading your primary and secondary injectors, do it with a single rail and simplify your fuel system at the same time.
One of the big concerns with stock manifolds is the front to rear balance in flow. We've redesigned the front to rear secondary ports to have matched flow rates, which is nearly impossible on a stock manifold, this ballanced flow is especially important in higher boost where it matters most.
Because this is a new casting, there is no thinning of the port walls from extrude honing or hand porting to obtain high flow rates. This also means there is still room for an all out race port never before attainable with the stock piece and at 12% lighter than stock. With removed heat riser passages and smoothed exterior, this piece has less opportunity for heat soak and much cleaner look.
This manifold is designed to use standard rubber o-ring injector installation. Metal spacers/adapters may not fit due to some modification of the injector port size. If you're converting to top feed injectors, it does require injecotr tip spacers or disc type aluminum adapters sold by many top feed rail manufacturers.
Expect to re-tune your motor after installing the manifold, the increase in flow rates can change the air fuel ratios."
13B-REW 4 port fuel rail - Secondary rail
"This four place fuel rail is exactly what you need to complete your new manifold. The new rail is designed to run four top feed Bosch style (EV1) injectors with 14 mm o-rings (injectors sold seperatly). We've also retained the factory fuel temperature sensor ported in the middle of the rail for maximum clearance.
All rails are threaded both ends for 1/4" NPT hose barbs or NPT to -AN (not stock banjo).
All ready have an aftermarket top feed fuel rail? We can add two more injector holes to your rail for $75. (shipping not included) Contact us to arrange to have your rail ported."