SeeForce

Larger turbos? Plenum? Headers?

Where lies the next bang for buck upgrade?

What say ye?

LargePuppy

Headers

polobai

Are you protuned? If so, then you will have to have the tune adjusted slightly when you add the next mod. If not, add the headers and then protune! I hear the plenum doesnt provide much in terms of power but not 100% sure myself.

koven

headers.. plenum doesnt do much is what ive heard

SeeForce

I’m not pro tuned.

what is the general increase in hp with adding headers?

polobai

15-22 whp depending on which ones you spring for. Vector/Kline seem to be leading the pack for 991.2 headers, Fabspeed not so much but I am sure its better than the factory unit.

Bill_76

Headers $/gain no doubt

garfunkle

ipd plenum

garfunkle

Everyone that has ever had one has loved it. People without the budget for them whine that they don't do anything.

Psorcery

This is 991.2 related.. Headers are triple the cost of an IPD plenum for the .2. The IPD plenum for the 991.2 is the same part as a 991 Turbo. Fitment is not perfect and installers have had issues putting them on... Lazy sales/engineering on IPD's part IMO for the 991.2

With that said, IPD plenum has shown gains under the curve but no peak HP gains. In some parts of the dyno graph, it's even or loses power.. I'm not against it but there are better mods out there...

Your next step is headers and protune. Once you're bored with that, then go bigger turbos.

koven

actually there's plenty who've installed for a .2 and said they don't know if it's worth it. without budget? lol c'mon, pretty sure anyone who has a 991 has $1K in discretionary spend

Norge911

I can understand on a NA engine that headers add some hp. But for Turbo charged motor at 15psi or more, are the gains still there?

what about intercoolers, more of cooler air should add some hp, anybody know how much?

Psorcery

I don't know about added 15-22 whp added on top of existing mods. But headers alone on a stock car would definitely net you gains.. With headers, more importantly IMO.. Throttle/boost response is definitely increased. Porsche uses a true header style manifold in the 992 whereas the 991.2 gets a log type manifold.

Intercoolers are not necessary at all.

2010panny4S

Hmm. For a 991.1 wonder if these would be nice added to some exhaust, Header, Cat and IPD upgrade?
https://flat6motorsports.com/collect...unners-991-981

Psorcery

WOW! Dundon is definitely reputable.

991.1 header, sport cat, IPD and protune is definitely nice.