RM01A is no where near as light as the Regu Carl. You have that wrong.
The RM01A fits nice in the middle of both the Regu and SF. Neither best at anything but a solid all around exhaust. Pun intended.
Sound and fit the Regu is hard to beat. For every last bit of performance gained than the SF is best.
While the SF is heavy the gain over other exhausts is not to be ignored. For the sake of removing the spare wheel the SF for power I've not seen anything close. Does drone a fair bit though.
The cars I've been in with the RM01A have no distinct note. Just sound like any other exhaust on any other car. Hate of love them both the Regu and SF are distinctive.
Not hating on RM01A they are a safe bet for sure.
Thanks for the info mate, the weights came form a supplier in Japan, he provided me all the weights and sound checks (db levels at set rev ranges) as my main goal is to get the highest quality exhaust I can which I can just bolt on in place of the current system with no need for a remap and which will reduce my db levels as I plan on using the car a lot more on track and with the tracks getting stricter by the year I just want to future proof the car.
The kaki is by far the best sounding but I want a system that's the best allround, I am not chasing numbers as don't believe in that with an NA Honda, with the Skylines etc I was happy too as it was easy to tune them and make gains but with the DC5 I just want it to breathe well, be safe and within the limits on track but to be quiet on the roads and smooth throughout the rev range, which is why the RM01A is winning so far I think.
I think you should go full 3" Solid Fabrications Carl. The Regu sounds sweet pottering around but once you're high up in the revs it's not a great sounding exhaust in all honesty. If I had the money I'd get rid and get a 3" custom system but it's up to you bud I guess. It's also very restrictive as demonstrated by my recent remap.
I love the Kaki for noise, but as you say it's restrictive... The RM01A is a rirect fit and will not end up with me requiring a remap whereas a SF may. However I cant see how the SF gives such gains as if the mani I have is a DC and say 2.5" how can from there back make a massive difference as the mani will be restricting me to 2.5" of flow wont it?
I think the only way of getting full gains from a SF is by means of a complete manifold back system, is this right or wrong guys