screamer pipe

[GazzaG60]

did this on a subaru. think it freed up about 30hp.

its loud when the gate is open but when its not its fine.

we used no box on the pipe. just a piece of tubing.

keep that gate shut as long as possible

[[RPM]]

thank you for the info GAZZAG60
I can go to work not going over 0.2 0.3 bar on the gauge (5 minute drive)
so I don't have complains @ 5 am

[prj]

280hp means you are running stock...
Under 400hp I don't think it will make any measurable difference. A de-cat will give you much more (if not done already).

[[RPM]]

280hp means you are running stock...
Under 400hp I don't think it will make any measurable difference. A de-cat will give you much more (if not done already).

yes I only have a MRC chip all the rest is stock even the cats
when the full exhaust time comes I will do it even if its just for the sound

[GazzaG60]

i agree at 280 hp with prj.

its not worth it.

we have proven on say a 2.5" system at 300hp or so a screamer as you call it is worth

1 better spool by a few hundred rpm on a bigger blower
2. upto 50 hp more. we measured about 45 more on an externally gated ej20t (2l subaru)

what it did was in essence give the benifits of a near 3" pipe without the 3"

[prj]

How can it improve spool if during spool wastegate is closed the majority of the time?

[GazzaG60]

i think its about as the build up started the gate opens or creeps and doesn't chock the exhaust the same. thats a 2.5" you see and at 300hp they struggle.

its not an easy explanation but we were imensly surprised. then a 3" was grafted in and that helped more again. maybe an illusion but it fely like it hit boost far quicker

to be honest the engine was in part build stage it had a massive to4r on a stock ej20t lol as soon as it did anything the pipes got chocked and egt went sky high. the dump tube just gave it a breather i think.

the sound was magic.