Pay in installments of $16.25 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 20 - Jul 25
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
FULL RACE 4 PORT MAC BOOST CONTROL SOLENOIDFULL RACE 4 PORT MAC BOOST CONTROL SOLENOID Our 4 port MAC boost control solenoid valve is designed to target a clearly defined boost curve and improve boost responses, and in some cases with a soft WG springquicker spool. The 4 port design works equally well in low boost and high boost applications. The 4 port MAC differs from a traditional 3 port MAC BCSV (boost control soleniod valve) because it precisely directs pressure to the open and close
FULL-RACE 4 PORT MAC BOOST CONTROL SOLENOID
Our 4-port MAC boost control solenoid valve is designed to target a clearly defined boost curve and improve boost responses, and in some cases with a soft WG spring—quicker spool. The 4-port design works equally well in low boost and high boost applications. The 4 port MAC differs from a traditional 3 port MAC BCSV (boost control soleniod valve) because it precisely directs pressure to the open and close ports of your wastegate diaphragm. This allows for a much lower wastegate spring pressure for better low gear boost control and perfect high gear, high boost control. Low gear boost means more traction at launch and lower gears and higher boost at higher gears when traction is usally less of an issue. This is commonly refered to as "boost by gear"
- MAC Part number – 46A-AA1-JDBA-1BA
FEATURES
- Better spool-up time and mid-range power
- Better duty cycle control to hit target boost and hold
- The solenoid is normally closed so that on failure you will run off the waste-gate spring only – to prevent over-boosting.
- 1/8th NPT fittings
COMPATIBILITY
- Ideal for use in sealed Dual Port Internal WG applications, Internal or External
- Hondata S300, K-Pro or Flashpro
- Cobb Tuning AccessPort
- All PWM modulated standalone and piggyback ECUs will support this 4 port BCSV!
Note: 4 Port MAC Boost Control Solenoid must be mounted upside down on B2 EFR frames. This allows the exhaust port to point towards the wastegate nipple. Use our mounting bracket.
OPTIONAL UPGRADES
- Full-Race Vacuum/Boost Block
- BorgWarner EFR Wastegate Hose Kit
- Fittings and Filter for 4 Port Boost Control Solenoid
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 14 reviews
Sort
Product Reviews
★★★★★ 4
Great for the entire family but expensive
So far so good. The brand of boxers we had been buying changed their style and construction so we needed to find an alternative. These have held up well so far to multiple weeks of frequent washing and wearing from the entire family. We did size up from the usual 6/M we normally buy and ordered large to prevent the legs from rolling up which worked out great. Our daughter likes the length and how soft the fabric is for wearing under skirts and gym shorts and liners stay put without moving or leaking as another reviewer mentioned. Our son says they are comfortable and fit well being just supportive enough without being constrictive. We all agree that there seems to be not enough fabric in the back as they tend to be much tighter across the backside than the front and that also causes the waist band to ride lower in the back than the front. These have better seam placement than some brands we tried with no seam across the lady bits and no seam down the middle of the back side so they are more much comfortable but the cost is also much higher and that is why we're only giving it 4 stars. These will stay in the rotation until we find something cheaper that both us and the kids like.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 24, 2026
★★★★★ 5
Pregnant lady review! Soft, comfortable, cool.
Color: 03-multicolour (4-pack), Size: Large
So soft, comfortable and cool. I'm pregnant and I've gained weight in my legs. I love wearing dresses but my thighs were rubbing together too much. These are perfect to wear under dresses. I also wear them under my bibs at work and it keeps me from getting overheated but I don't have to worry about whether or not my underwear show since they just look like shorts. I wish these came in maternity. I just keep them below my belly. I'll be buying more for sure.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 8, 2026
★★★★★ 5
I want to live in these
Color: 01-multicolour (4-pack), Size: Medium
I bought 4 different sets of new underwear. Unfortunately these came last. It’s unfortunate, because if they had come first I would have cancelled all my other orders or returned them and ordered more of these. I never want to wear anything else ever again; these are the comfiest undies I’ve ever owned, I want to live in them. I can wear them under pretty much anything except leggings or very tight pants (but let’s be honest, I don’t wear those anyway.)
They are incredibly soft and breathable, they wash well, don’t roll, keep my thighs from rubbing, are comfy to sleep in, and the colors were true to the photo.
Just a heads up, they are on the thin side and just a bit see through in the rear.
I’m 5’5” 140lbs and the mediums fit perfectly, they go about mid-thigh.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 30, 2025
★★★★★ 5
Extremely comfortable
Color: 02-multicolour (4-pack), Size: X-Large
These are by far the softest and most comfortable underwear I have ever owned. The leg portion absolutely does roll up as so many others have mentioned, however, I did not find that to be uncomfortable at all just annoying that they don’t stay in place.
I bought these specific underwear to see if it would help alleviate HS symptoms at all. They have definitely helped with wicking moisture away from the skin. More time will tell if it’s truly helpful for HS. For now, I will recommend these. They are thin, breathable, butter soft, wick moisture comfortable and I would buy again…maybe in a different style next time. I have washed them several times and they seem to be holding up rather well so that is also of supreme importance given the cost of the item.
Again, I would recommend this item and plan on purchasing more in a different style very soon.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 13, 2025
★★★★★ 3
Eaten by my Thighs
Color: 04-multicolour (4-pack), Size: X-Large
I wanted to love them. Sadly they have let me down.
Pros: natural breathable fabric , super soft and comfortable, cotton panty gussets for feminine health and panty liners will stick!! Yay:). And the colors! They are great!
But here’s the Con. And it’s the con of all cons.
THEY RIDE UP!! Eaten by my thighs. I’m 5’6” and in the general area of 175. I fluctuate depending on how many times I visit the bakery! :) I don’t have a thigh gap but it is not a super tight thigh squeeze. I seldom have thigh climb but these do. I tried two different sizes to see if that made a difference. Nope.
I was miserable at a recent theme park in these. I was wearing long heavy dresses and it was quite awkward to yank these legs down non stop.
They feel amazing and they have all the requirements
1. Soft
2. Comfortable and stretches with you
3. Breathable with nice thin fabric. Not bulky
4. Natural fibers
5. Great colors
If you are a person that is not blessed with Thunder Thighs, please order these. They are great! I wear them at home and to locations that I will not be doing a lot of walking at. I have washed them so many times and they look like new still.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 4, 2025
recommand products
Duvalay VW Campervan Compact Travel Topper (1900 x 1300)
194.99
SCOUT II 71-80 ROUGH COUNTRY N3 FRONT SHOCKS for .5-2.5" OF LIFT
99.00
3/4 Ctw Lovebright Round Cut Diamond Earrings in 14K White Gold
1470.00
Outwell Premium Spike Heavy Duty Hard Ground Tent Pegs Awning with Peg Puller
17.99
Silverline 3-Digit Combination Book Safe Box 180 x 115 x 55mm 534361
13.99