kpr

Only if we can do a 4 x red starlet race. plenty of room for 2 in each lane

@Dudley red starlet ?

Are those stepped headers David?

remember the dizzy will be spinning at half speed of crank. so 20degrees advance is only 10 degrees at the rotor

Yep, I never got around to adjusting the length to dial it in though. my trueno with same engine and pretty similar muffler setup was quiet and no drone. (3" with 2 straight through mufflers) I think the plumb back wastegate pipe just happened to be the correct length size. since its just a pipe with a blanked off end untill the gate opens

Yep the megaphone will make a weird noise in the lower rpm. but usually over a real narrow rpm range. its pretty hard get rid of, but drive around it. my pipercross filter is also upside down

Have done a little bit. my headers have a step about 120mm out from head. When i originally built my big headers they were 44.5mm od primarys all the way. This was pre dyno, but i always checked for afr change when changing anything. which 99% of the time leaner = power gain. so vs the 38mm primarys there was zero gain up top and losses below 6000rpm. i modified them with the said 120mm section. using 38mm tube out of the head that flairs (not a step) up to the 44.5mm tubes. It gained power from 6000rpm onward, with same losses down low. which indicates the transition between the 2 pipes is where the gain come from. Its one of those things thats a whole lot of work to fab and test. so haven't done a whole lot more on it. But, I can says post merge collector, a diverging cone always beats a step. Is it the same thing in the header primary's? i dont know. ive never seen it done like that before. maybe because its too hard basket to to fab the tapered transition, no one has really tried it

@Rhyscar what angle are you using on your diverging cone?

if done correctly. choke point and diverging cone, will make more power than a big pipe straight on the end of the merge. esp off the bottom and midrange. diminishing returns the bigger you go with the diverging cone / megaphone.

I run toda pistons. wonder why he took them out haha

hose clamp helps when doing stuff like that

Other than ignition timing changes. All you need to look at is afr and injector duty cycle, same afr and more injector duty = more power. isn't many cases when this isn't true.

k24 pretty easy to get 250hp at wheels. stock engine with cam upgrade and good bolt on's

I havent done any v8 stuff. but on 4 cylinder 1.6L making around 175hp at engine. this is close to ideal setup , after the collector its 2" then tapers up after the vband to 3" into a glass pack. after that you can get away with more sins. So yeah if you want to get fancy with it, carry on tapering down your collector to 2", run 2" for for a bit, then chuck in a 2" - 2.5" exducer cone with 2.5 inch reso's directly after that, bigger they are the better. some of the small ones dont really do much. think of the reso as the exhaust ending. after that do what you like really. merge into a single 2.5 or 3" and add mufflers till its quiet enough. you might grab a little bit of power off the bottom and in the middle doing it that way. otherwise your original plan will probably work fine