Butt dyno is better than no dyno.

 

I understand its a bit subjective to some, but to me, my butt never lies =)

 

I've got an ebay version BFI kit in my garage for my '98 sc 400 federal car. This includes a shield from the heat of the engine compartment. I was hoping to find a donor airbox to open up, but so far no luck.

From what I've heard there is better acceleration response with the BFI. I drive in traffic a bit and would enjoy more responsiveness for sure.

Does the butt dyno mean more responsiveness too?

 

Even if there was no hp gained, it was worth the hour of my time to have a cool intake sound. If anything, I got to remove a bunch of leaves that have been stuck under there for who knows how many years. Weight reduction

 

Butt dyno means everything.

I've seen 350Zs LOSE HP on a dyno because of intakes, yet the butt dyno registered at least a 15HP gain.

 

its a bit subjective yes, I noticed more lower end response but not much if anything on the top end (who knows it could have lost power up top as you said).
As long as you like your new powerband, thats what counts, a dyno on the internet is just a dyno on the internet.

I suggest some of the people who haven't tried different ones just try them for yourself and see.
When I had the stock setup it took me like a weekend to find a couple spare air boxes its not like its a permanent modification then, 4-6 bolts and you have them swapped out.
I had a completely stock air box and a bfi airbox. I really think if you seal it off properly and under the headlight it does work better than stock, but I never went that far.

actually the drop in aftermarket filter for the stock airbox seemed to help majority of the way.
I had the K&N on the SC back in the day which was ok but I didn't like how oily it was (can mess with Karman maf over time). a simple wash will help with that though.
I have a drop in performance spectre filter on my GX cause it looks like its well made and it made the whole system breathe easier.

on the amazon page for the spectre drop in filter for the sc300/400, there is a review of a 400 owner saying it improved throttle response as well, so I am not the only one who feels that way.
100% start with a drop in aftermarket filter (unless you drive through dust storms everyday), then later worry about BFI or no BFI.

 

Thanks for the suggestions and the link to the Spectre filter. I dropped one in about 5 days ago and noticed an improvement. Still looking for an airbox donor to play with the BFI.

 

A great filter to use when doing BFI is the APEXi or Blitz drop-in filters. Both are dry filter media that allow more air thru but still filter as well as stock. And they're not crazy priced either. Usually only $45