P&P Plenum VS Aftermarket

[GA_StangGT]

The title says it all. I'm interested in what everyone thinks of this. Will a highly ported and polished stock plenum perform as well or better than an Accufab or Dragon? Anyone out there have any experience or dyno numbers to prove which is better?

 

[StangYellow]

Im sure that the aftermarket plenums are flow bench tested to achieve maximum results. However, porting your own plenum is free, and you cant beat that. To answer your question, HP increases are minimal, and the aftermarket ones would probably provide a tad more HP than if you were to do it yourself.

 

[propellerhead]

I have the Accufab but I got it more for looks than anything.

 

[GA_StangGT]

I started the thread because I have seen some on eBay that claim better flow than Accufab and Dragon. I found the claims interesting.

IMO, I'd take a Dragon over the Accufab...it's +/- 1HP difference in performance and a lot more affordable.

 

[StangYellow]

Yeah Accufab's are way too expensive for 1 extra HP. I took a Dremel tool to mine years ago, didnt notice anything at all.

 

[twogts4us]

There is not enough material to properly port the OEM plenum to get the desired results (especially in the 'floor' area of the inlet). As much as the OEM and aftermarket elbows look alike, they are radically different. That said, it's minimal gains (for the aftermarket ones), but honest gains. I dig my Accufab with the 70mm TB...it pulls much better above 3K RPMs. I can't imagine they could make much of a difference with an OEM elbow...and their testing...is it independent? Or did they do it themselves? You know there are ways to make it look like you've made more power...or they could simply outright lie to you...(I mean, come on, it's EBay...here today, gone tomorrow)

 

[justinschmidt1]

I remember seeing a flow test before...all the aftermarket ones were around the same..the ported stock one was lower than all of them

 

[GettinThere]

However, porting your own plenum is free, and you cant beat that.

While the cost of the various (Dremel) grinding bits is not much, they are not free. Plus the cost of your time, which has value.

...HP increases are minimal, and the aftermarket ones would probably provide a tad more HP than if you were to do it yourself.

+1

I still think the best plenum value out there is the $99 Trick Flow (TFS) plenum from Summit or L.R.S.

 

[BennyBlown2v]

There is not enough material to properly port the OEM plenum to get the desired results (especially in the 'floor' area of the inlet). As much as the OEM and aftermarket elbows look alike, they are radically different.

Well said! The interior dimensions on the stock plenum are far, far smaller than an aftermarket plenum.

 

[doubleomustang]

i had a k&n cold air on my 00 then bought a 80mm TB and had my stock plenum ported. i noticed a big difference in power after the add of both the larger TB and ported plenum. i also already had the cold air tho. IMO if your serios about more power save your money and buy a supercharger.

 

[BurningRubber]

80mm? Holy crap dude.

 

[fobra559]

80mm? Holy crap dude.

Isn't that overkill? I hope your going the FI path.

 

[doubleomustang]

no the 80mm worked great for me. i am in the process of installing a vortech supercharger tho. but it worked very well on NA

 

[fobra559]

no the 80mm worked great for me. i am in the process of installing a vortech supercharger tho. but it worked very well on NA

Right on bro! You car will love that 80mm even more

 

[the98stang]

However, porting your own plenum is free, and you cant beat that.

Free > $200+

 

[BennyBlown2v]

Free > $200+

Says the guy who just recently bought a throttlebody/plenum

 

[doubleomustang]

i think it was $65 to have my stock plenum ported by my local race shop.

 

[DropTopPony]

Before the aftermarket plenums came out we all were sporting stock ported plenums and intake spacers. The aftermarket plenums are the best of both and for a decent price.
My Steeda spacer was like $50 and the porting was about $40....so it wasn't much cheaper then the plenums out now.

Back then we had no other option, today its easier to just buy a $99 plenum that flows better.

 

[fobra559]

Before the aftermarket plenums came out we all were sporting stock ported plenums and intake spacers. The aftermarket plenums are the best of both and for a decent price.
My Steeda spacer was like $50 and the porting was about $40....so it wasn't much cheaper then the plenums out now.

Back then we had no other option, today its easier to just buy a $99 plenum that flows better.

TrickFlow

 

[doubleomustang]

My TB came with a spacer. i never put it on tho because it wouldnt fit. if i spaced the TB out then the throttle cable and cruise control cable wouldnt reach. it was a big pita. i was told they didnt do anything anyway....made a good paper weight tho.