3.5 inch Mazdaspeed 3 Power Series Intake System

The build of this intake was amazing! The 3.5 inch intake helped so much with gaining more air and you can definitely hear the turbo whistle a lot more. Pulls a lot more air to help with the turbo. Paired up with cst4 its unbelieveable. The power gains was outstanding!

You will definitely see power gains when using this intake on a stock turbo. It definitely improved sound as well. Install was a little tricky, the fitment is tight. Not a lot of room where the turbo inlet is located, the cooling lines near the firewall on a gen 1 speed 3 kind of interfered with the turbo inlet pipe. With some persuasion it can fit. The factory 10mm stud that attaches the turbo inlet pipe to the bracket provided some issues. I had to loosen the bracket completely to install it to the turbo inlet pipe, then reattached the bracket to the engine.

I went with this intake since I do have plans on switching turbos to the CST5. And this intake will support that.

Ok, I will start with this, as it is the most important point..



Even with a K04 you WILL see gains from this intake over just a 3" or smaller. Check out my datalogs and Vdynos on MSF with JUST this SRI/TIP and a Corksport TMIC. I am hitting 250-260 WHP at 5600 to peaking @ 6k rpm consistently, and about 250-260 WTQ in the late 3k rpm range, it has literally balanced out my HP/TQ numbers beautifully, and brought the peak power smoothly up the RPM. This is all with a OTS Cobb Stage 1 +IC 91 flash tune (with a 3.5 MAF calibration of course) untouched by a real tuner. It's clear that even a stock turbo will benefit from this sized intake, and then you are always ready if you ever happen to go to a bigger turbo.



I still have the 80mm CS catless TBE exhaust to install, and I should see even more gains and a bump in TQ/HP ratio.



Another big reason I went with all CS power/flow adding parts is because they were R&Ded together, which usually means a slight benefit from running all the same intake/IC/exhaust parts.



I thought I'd share, check out my build thread on MSF for a walkthru install soon. Feel free to ask me any questions about the product or install.



Definitely spend the $ for a ECU relocation BBox from CS (or at least plan on relocating your ECU somehow) when you go for this SRI. Install them both at the same time to speed up the process.



You might want a heater hose extension kit to make this fit easily down by the turbo/TIP coupler. I was able to get mine to fit with some silicone spray. You can buy your own HH ext kit for like 6-10 bucks at any parts store.



I love it. I think a pro tuner could easily tune another 10hp and about the same in TQ. At the wheels, compared to most stock MS3 Vdynos I made about 45 WHP and a little less WTQ, but each upgrade route is a little different, my TQ will come back with the catless TBE.



And it sounds FANTASTIC.