guesstimate bhp for my manifold.

steve2761

just got my 200cell cat welded into my 2.5" downpipe which leads up to my four branch that i recently bought from blacksheep.
linked up to magnex 2.5" centre and vec gsi twinslash box (clf/magnex)

the four branch and downpipe itself is a Friedrich motorsport item.

just wondering what rough ideas of gains this manifold setup will give?

will be moving on to mild head work and cams when funds permit.
cheers guys.

steve2761

hope link works.my pb being an arse.

https://s1297.photobucket.com/user/Steve2761/media/temporary_zpsada49202.jpg.html?sort=3&o=0

MikeS

around 5-10 BHP depending on condition of old exhaust

Matt

I've added a proper link to the img in your post.

steve2761

that was my rough guess too.just needed someone else to confirm my thoughts.
tbh,the crack in old manifold combined with a broken stud on the downpipe join (wasn't me!) it was blowing out all over the place.

one thing that was my fault was a bodged in 200cell,clamped and sleeved all over the place.WAS temp whilst i had a duff flexi and original cat.
hope being for a decent gain now!

steve2761

Matt said:
I've added a proper link to the img in your post.

cheers matt,when writing it i thought someone would pick up on it.

MikeS

z22se are like the old x20xev engines where they blow around the manifold downpipe area

I have the lexmaul manicat with 200 cell
https://z22se.co.uk/threads/complete-custom-exhaust-astra-g-z22se.23344/

steve2761

MikeS said:
z22se are like the old x20xev engines where they blow around the manifold downpipe area

I have the lexmaul manicat with 200 cell
https://z22se.co.uk/threads/complete-custom-exhaust-astra-g-z22se.23344/

i like the look of that lexmaul.VERY nice.

the last couple xev vecs i had did that very same thing.

MikeS

in the end I gave up and just bought a brand new downpipe and manifold on my cally x20xev

MikeS

btw the magnex centre section makes a big difference 😛

steve2761

MikeS said:
btw the magnex centre section makes a big difference :p

doesn't it just!had a Hoffman pipe onto letterbox when i put the cat on and it popped and farted something silly!

was talking to pottsey and he suggested finding a magnex.ironically that day i found one local CHEAP.

sound improved lack of original backfire and performance returned.

MikeS

on my old Vec B I had a piper manifold, 2.5" downpipe and sports cat with 2.5 " magnex cat back and it drove completely differently, pulled from low revs all the way to red line, where standard 2.2's drop around 5500rpm

I got racing tube on my Astra G and I am thinking bout dropping the lot and getting a decent cat back