Thread: Product review: BPi Flow Stack

This should change in the future, as we launch a 4" which will either have a 7" or 8" filter flange. Our problem is sourcing a 7" or 8" flanged filter.

Interesting! Yeah the problem will become finding the right filter.

Now Bryan, if I get a chance to go to the dyno again, and test the filters, flat top vs the open top, and open top ones do better, do you think you could start getting those?

They have a velocity stack build into the filter it self. Here are some pictures that I currently have, I will try to take more tonight.

You really need to offer the 4 inch in a 2.5 inch model... alot of fitment issues for C/A applications would be resolved

+1 on Vadim's post. That way I wouldn't haev to buy the JWT filter and the BPi flow stack.

Ha don't expect it anytime soon though

I really want to go back to dyno and tune, but I will fix my piping before that haha

So true

oh well, i still have that jwt filter and bpi flow stack to look forward too. just gotta sell some more parts and i'll be able to afford it.

I mean I'm sure the filter that sells with BPi would be about the same. The next best thing to a dyno is my beltronics or scan gauge hehe.

Hope to have you covered in the future. Tooling is rediculously expensive, and the debate is 4"x7"or8" and 2.5"x4"or5", but the likely direction is the 2.5" simply because filters are readily available.

I would love to see the results. I am not sure I would act on one test regardless of results, but it would definately have me investigating it further if the results were positive.

I would not go so far as to say its got a velocity stack built in, but with the filter media at the top you have a more favorable flow path, particularly for your typical filter on tubing intake systems.

I left my stock tubing (the part behind the overflow res with the sensor it in) to hopefully help funnel more air in the direction of the filter. And with that open top I think it provides a smoother more efficient airflow at a higher velocity. But that's all conjecture.