Skip to product information
1 of 4


Acuity - 6” to 3.5” Aluminum Velocity Stack

Acuity - 6” to 3.5” Aluminum Velocity Stack


Category: Velocity Stacks
Regular price $45.00
Regular price $50.00 Sale price $45.00
Sale Sold out
You save 10% ($5.00)
Shipping calculated at checkout.
In Stock
No reviews

Acuity - 6” to 3.5” Aluminum Velocity Stack

  • 6" (152mm) inlet with barb feature to help better secure air filter
  • Reduces to 3.5" (89mm) outlet
  • 2.35" (58mm) overall height
  • Parabolic reduction for improved flow
  • 5052 aluminum construction with matte black coating for corrosion resistance
  • Great for adapting a  6" filter to a 3.5" pipe or for reducing turbo inlet losses

Spun from 5052 aluminum to a parabolic profile, this velocity stack is a great way to adapt a filter with 6" (152mm) opening to a 3.5" tube or to simply reduce inlet losses on a 3.5" (89mm) tube or turbo inlet. Often, spun velocity stacks don't feature beads to help retain filters, leading to poor filter fitment. And with its 1.3mm (0.05") wall thickness, it's perfect for welding to industry-standard 0.060"-wall aluminum tubing if making a custom intake setup. ACUiTY's velocity stacks feature a rolled bead on the large end and a flared outlet on the small end to make sure your filter and coupler stay attached. Additionally, a durable, matte black, painted coating is applied to each velocity stack for corrosion protection. 

Compatible with cone-style air filters with a 6" inside diameter and 3.5" inside diameter silicone couplers


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations. For international orders, please Contact Us. If you select US shipping rates and are shipping internationally, please be advised you will be contacted to compensate the difference in shipping fees.

Due to the high volume of orders for Black Friday, processing takes about 3 to 5 business days before your order ships. There may be shipping delays. We do not process or ship orders on weekends. If you order an item that's on backorder, we will reach out with an estimated arrival time. If you have any questions about shipping make sure to email us at or call our reps today at 732-638-5268.

If by any chance, your package that has been delivered by the carrier is lost/stolen, YOU (THE BUYER) are responsible for working with the carrier and us, Tri-State Motorsports to recover your package. You must contact us and the shipping company within 48 hours of delivery for lost/damage claims. You are covered by the basic insurance amount APPROVED by the shipping center. We DO NOT refund or reship product for claims that are denied by the shipping company.


When will my product ship out?

Processing on in-stock items takes about 2 to 4 days before your order ships. Some orders may take longer than usual to process and ship. If you order an item that's on backorder, we will reach out with an estimated arrival time. Refunds are subject to a 20% restocking fee. Cancellations are subject to 10% cancellation/processing fee under no exceptions.

What's the Warranty on our products?

Unless the product is manufactured by Tri-State Motorsports or TSM Race, ALL Warranties go through the Manufacturer directly. Please visit their official website and get in contact with them in regards to your warranty. We will supply you with any invoice or tracking information the manufacturer asks you for.

Do you offer any promotions?

One of our major promotions is the TSM Bucks Loyalty Program. You will earn 1 TSM point for every dollar you spend with us. These points can be redeemed for rewards when you reach certain thresholds. 

TSM Bucks Info

If you subscribe to marketing emails, you will be given a discount code for 5% off your order that you can use at any time. Our Instagram page also has a variety of weekly promotions in our stories and posts. Some restrictions may apply depending on MAP policies.

What payment methods are accepted?

Tri-State Motorsports accepts American Express, Discover, Mastercard, and Visa. You can also pay over time with Affirm and Klarna. Express checkout methods include:

  • Apple Pay
  • Google Pay
  • Meta Pay
  • PayPal
  • Shop Pay
  • Venmo

How can I finance my purchase with Affirm?

Learn More On Affirm

How can I finance my purchase with Klarna?

Learn More On Klarna

View full details