Last Updated: 02/06/2022 @ 07:26 am
If you want to add an easy 25WHP to your Altima or Maxima then look no further. Our SFR high-velocity manifold is an easy bolt-on and adds 25WHP to an NA car and up to 50WHP on turbo cars. We also offer an aluminum engine cover that goes with it to really dress up the engine We also offer the intake manifold for the later models Altimas and Maximas.
I was fortunate enough to have the first SFR High-Velocity Manifold put on a N/A vq35. From what Tim at Speed Force Racing told me this manifold is slightly different from the manifold made for forced induction cars.
I have had the manifold for months. When I first received it I was impressed with what I saw. The design is wicked and looks waaaayyy better than stock. It took me a while to slap it on at first because I had to find and purchase the correct barb fitting to hook up the vacuum hoses. At first, the installation was a bit time-consuming because I didn’t know what I was doing. I have installed the manifold on and off about 6 times already so installation for me is under an hour.
The sound is pretty cool. At low revs during soft acceleration, you hear a humming/growl from under the hood. Under hard acceleration, the engine sounds great! it isn’t loud and obnoxious. It’s more of a deeper growl, nothing too crazy or far from stock, but noticeable.
At first, I could only go off of the butt dyno and my butt dyno liked what I felt. To me, the mid-range was increased a lot. I knew the torque was increased a lot (dyno showed 10wtq at peak). Up top, the car felt great as well. My car just easily pulled to higher RPMs. I could definitely feel the car breathing MUCH better. Even while cruising at lower RPMs the car had sooo much better response.
Here are some pics of what it looks like on my car:
Some graphs got mixed up at the shop but I managed to get the most important ones. The graph shows the highest dyno from the stock manifold with the highest dyno with the SFR manifold. the other graph has the highest stock vs. a couple runs with the SFR manifold but also shows the torques as well.
I picked up almost 30whp at redline alone.
I was amazed at how much power was picked up at redline. this isn’t your average SSIM dyno graph only showing gains up top. You can clearly see there are gains on the ENTIRE powerband. Peak rose 5whp (wish it was more). What’s important here is the area under the curve. midrange you can see ~12whp gains as well!
I like this manifold very much! yes, it’s not a cheap mod but for the overall power, it’s worth it. It adds power where cams don’t and cost half the price. Plus install isn’t that hard. To me, it was well worth the money spent.
Additional Reference Photos