Search This Blog

Friday, February 26, 2010

Exhausting gasses

Finished the big tube race header and Laguna exhaust prototypes over a month ago. The Laguna is the right shape and sound but still a bit too heavy at 22lbs with two resonators. We're going to go to a thinner wall tube and lighter resonators. Should end up at around 17lbs for a header back 2.5". That's really light. The super light Fujitsubo street exhaust was our weight target at 17 lbs but its a smaller 2.375" and a shorter cat-back. The cat back 2.25" version of our exhaust might be closer to 15lbs so that's good.

Header should make lots of midrange torque, that's what it's designed for. Problem is to get the optimum runner lengths and steps in the right place, we had to wrap the primaries up like spaghetti next to the frame rail. That means it's a two piece and no fun to install. Like not even a little bit of fun. In fact, it's kind of a PITA. Sad because it's going to make lots of power but we can't expect to sell to many because of it's no compromise construction. That's what you get when you go to one of the top header builders in the country and ask for a no compromise race header. oops.

So we end up needing to design a second header that's more of a compromise. Something closer to the Racing Beat but still with the longer primaries and venturi collector the RB doesn't have. A one piece that is easier to install, and hopefully, easier to manufacture. The RB is good but I know I can do something better that will cost less. So I'm obsessive!

Been too busy to do any more than one short, inconclusive dyno test (not back to back comparison). Will try to get some dynos done in the next 4 weeks if possible.

The exhaust will be easy. We already have a customer asking for a system for an S/C car that will make 350whp. That means 2.75" and our jigs are all set up for 2.5". It occurred to me that a 2.75" race exhaust would accommodate the street turbo guys very well since they don't need quite as much baffling. So there you go, another product.

Meanwhile it's 1:21 and my second beer just ended. Good night.


  1. any idea of a release date? what's the decibels of it? i want to run more at Laguna Seca, but my current exhaust is above there noise limit of 98db.

  2. No ETA yet. This is one of those projects that will just happen when it happens. Our first protos were good but we can make them lighter, so we will. Next step is bringing the price down. I can build you a hand made duplicate of the proto right now but it'll cost maybe $600. Give me maybe 4 more months and I'll be able to drop that down quite a bit I think.

    Best bet for LS on an NA is the Fujitsubo we have now.


Note: Only a member of this blog may post a comment.