any reason why a downpipe would go from 2.5inchs, to 4inchs, to 3-3.5inch???

[jimGTS]

the downpipe on my apexi kit, is strange...

instead of going from the 2.5inch (i guess) turbo side, to 3-3.5inch to fit to the exhaust
it has a massive 4+inch section welded in the middle, which goes back down to 3 to join the exhaust....


any reasons for this??

[Tiny]

the only thing i can think of would be for strength and crack prevention got any pics?

[craig]

got any pics?

bad question to ask this guy. cue 500 photos of downpipe........

[mattcambs]

Jim I can't help thinking you'd be better off with a completely standard car. Then you wouldn't worry about things so much


It's probably a sports CAT

[craig]

Jim I can't help thinking you'd be better off with a completely standard car.

I couldn't agree more, he must have taken a week off work to look at every nut and bolt on this car

[jimGTS]

would be nice if it was a CAT, but this section of the DP does have a phoenix power plaque...so either custom downpipe, or a welded in CAT, or its just creating a freer flowing section if it isnt a CAT.


im not worrying, lol..
just like learning new things about the car....and trying to find out whats what.
its sad, but exciting, lol.
and theres no way i would of got a stock car after piling in a load of dosh at my rev2...lol
had to be like for like upgrade really, only reason i went for it.

[splashnatz]

i'd guess cat too.

- or they cobbled it up form bits of left over pipe LOL

[jimGTS]

maybe they did splash, as theres like 6 separate welded sections on this thing, creating the different widths, lol...




would be awsome if it was a CAT, saves me a massive hassle come mot time!
(thats if it still passes with it tho!)

[Tiny]

will it pass with the Screamer then?

[jimGTS]

well i asume they just pop a probe in the exhaust?
that cant read anything from the screamer, as its 4 foot away?

[shaboy]

not a hundred percent sure bu ti might have read that they treat the screamer as a blowing exhaust

could be totally wrong on this though

[jimGTS]

not a hundred percent sure bu ti might have read that they treat the screamer as a blowing exhaust

could be totally wrong on this though

isnt the screamer shut unless its on boost?
so exhaust gases go through exhaust as normal....but when on boost, wastegate opens and dumps some of this gas through the screamer, but only when on boost?
and you cant hit boost when just revving to what ever they rev to?

or am i totally wrong.

[splashnatz]

mines been through about 3 MOTs with screamer and loads of others have too, so no worry about that.

Jim, - that is the strangest downpipe i've seen LOL - but if they thought enough of it to put their name to it, it's got to have a legitimate use surely... i was expecting the pic to look more like the SARD high flow cat. Still, you should be able to find out for sure once they check the emissions ...

[jimGTS]

prob werth me getting emission tested a few months before the mot, just so i have time to decide how im gona tackle it when it matters. lol...

yeh is very strange when i looked at it...
i orginally thought it just went out cause the large turbos seem to have small starting diameters, but this gets seriously wide! then goes back down to normal to connect to the exhaust...

[pez]

Sorry about changing the topic here but what is this screamer you are all talking about and what is its job?

[SFLee]

screamer is the small pipe next to the down pipe

its job is to scream when it on boost letting out extra exhaust gas though the pipe rather pushing it though the turbo

I am sure no track day with that thing there

[lockys96]

i confirm its a phoenix high flow cat, will flow at least 600hp.

i had mine cut out and binned, and i kind of wish i hadnt as im sure i gained a few db which is not what i wanted

[jimGTS]

so its a CAT, not a straight through downpipe locky?
prob is is it enough to pass uk emissions, lol, may be enough to pass the jap ones.

thanks

[mattcambs]

so its a CAT, not a straight through downpipe locky?
prob is is it enough to pass uk emissions, lol, may be enough to pass the jap ones.

thanks

only one way to find out.

I reckon this is a right result for you Jim seeing as on a rev 5 you would need to pass the stricter emissions test.

[Andy F]

Just to clear up what a screamer pipe does...
When the turbo reach's its set boost (what you set it at) the waist gate will open and bleed off the exhaust gas's down the screamer pipe, so no more boost is made, so if your boost is set at 1.4 bar the screamer will start to work earlier than if you are running 2 bar ect IYSWIM