Downpipe Volvo 855t question.

Post by **rguzz** » 23 Jul 2016, 10:38

It's a 96 stock and with original exhaust system. Car is very functional with many items addressed, TBV, wastage, vacuum lines, stage 0, etc. Runs great, high miles unknown. I'm thinking of OBX or similar exhaust but will likely never have the car tuned other than possibly a stage 1. Has original turbo that was rebuilt once. So, will I get improved performance from a bigger exhaust system alone? Porting the exhaust manifold? Do I have a straight or angled downpipe? I know, I could look but what was the factory configuration for the 15G turbo? The question really is should I bother with anything other than stock replacement of exhaust and associated parts, cat etc. considering I'll likely never tune the car other than maybe the ECM. Advice appreciated.

GMTURBO · Post by **GMTURBO** » 23 Jul 2016, 12:53

Bigger exhaust always helps turbos - within reason. Too little back pressure can lead to issues with overboost, but it doesn't seem to be an issue with the 850. You'll have a straight flange on yours unless it's been changed at some point. Just an FYI the OBX downpipe doesn't have a cat.

Post by **rguzz** » 23 Jul 2016, 14:23

Yes, thanks, I guess that's the complication and source for added cost.

beigg · Post by **beigg** » 23 Jul 2016, 16:21

Who even sells just the downpipe for the straight and slant flanges?

Post by **rguzz** » 23 Jul 2016, 19:27

I don't know that anyone does. But OBX gives you both in their kit, no?

Post by **rguzz** » 23 Jul 2016, 19:32

I don't know that anyone does. But OBX gives you both in their kit, no? I realize that would still leave me short the rest of an exhaust system, though.

beigg · Post by **beigg** » 23 Jul 2016, 19:40

I have bought obxs dp and am not impressed. I might actually have the straight dp still since ive only used the angle dp.

Post by **hausmeister** » 24 Jul 2016, 11:52

It is much easier to swap the turbo housing to angled and get one of these downpipes.

beigg · Post by **beigg** » 24 Jul 2016, 16:28

Dismantling the turbocharger can be a process. Especially if the lines and hardware dont cooperate. I had to extract a few stubborn pieces in my dp change out.