does anyone know a shop or somewhere that can port stock exhaust manifolds?

i know it sounds retarded, but any help would be appreciated

 

is there any specific reason why u want to keep them...?

 

one word - CALIFORNIA

hahaha i know everyones gonna be like get longtubes, but im keepin these

 

oooo yea, that does suck....u can go with mids or shorties....i know the shorties will pass theyll look cleaner then ur stockers....

 

shorties will pass, i think

but i found a place thatll do the work, so depending on the price, it might be cheaper, and i dont care if they look good or not,

 

macs won't pass as they still move the stock location of the cats, shorties will pass and should be your only option... it's not even worth porting the stockers

 

shorties shouldnt cost much at all bout 250....i mean if u wanted them ported thats up to u...just sucks to live in cali lol

 

doesnt everyone say "shorties arent worth the money cuz they are same as stock manifolds"

so if i can get my stock manifolds(which flow as well as shorties already) ported, ported manifolds would be just a tad better. i know im not going to see HUGE gains, but im keepin the stock manifolds. so im gonna make the best of them.

 

Personally I see no benefit in porting them, just gonna cost you a wedge of cash for little gain (0.5-1hp) IMO.

Flow isn't the issue with them, sure they are not great flowing but they are good enough for a modest bolt on 346ci n/a engine. Scavenging is what good exhaust tuning is all about on n/a applications. And LT's are really the only true answer to this.

Shorties will outflow stock manifolds due to their tubular design, but as I said they probably won't make many odds on a bolt on LS1. If you're going for a serious high reving h/c setup then shorties will be better than stock becuase of the better flow, but as they still won't scavenge you won't see much past 5rwhp increase.

If you want shorties and really want to remain legal you need CARB approved ones, not all of them are.

Personally I believe if you are in CA there is only one way to mod a car - FI. I believe some of the procharger kits are CARB approved. These will work fine on stock manifolds and well over 400rwhp should be attainable. Shorties will actually work very well on FI however, as svavenging doesn't take place and flow rate is more important. On a boosted LS1 the extra flow rate of the shorties will be worth it and would probably show somewhere in the region of 20+rwhp increase over stock manifolds.

 

well thats good info. i will not be going FI on the car.

so basically ur saying..

ported stock < shorties

 

Stockers aren't horrible, but porting them is really going to do next to nothing. If you want to spend money on it, get shorties.

 

why don't you get your car smogged, then bolt up long tubes and an ory. then throw your stcok stuff back on come smog time again. I mean it is not like the exhaust is going to be rusted together.

 

because hell be raped by road side checks.


i would get a set of carb legal shorties and build a nice exhaust setup.

 

x2!

my buddy got pulled over for nothing, just picked him out and made him pop his hood, saw the longtubes. they were about to tow him, so im not gonna risk it, true a lot of people get away with it, but for how long

 

just to let you know pacesetter has pretty much the cheapest shorties on the market.... and they're coated, if that what your looking for. i have them and they flowed great but im putting LT's on in a month.... pm me if your intested cuz they're not a sponsor (pacesetter is but not the shop)

 

The reason for porting stock manifolds would be to save some $$. Hinson supercars can port them for $75 I believe. $75 is alot cheaper than you'll find shorties for. I spoke with them awhile back and I think they said the porting was good for 10-12 rwhp. If the 00-02's manifolds are nearly as good as shorties, then wouldn't porting put them in the same league for only $75?

 

thats a lot of work for 10 hp

 

It's not when you're taking off the heads for a headswap anyways.

 

guess i missed the part where hes swapping heads

 

Send the stock '01 -'02 cast manifolds off to Extrude Hone. They blast an abrasive media through it for several hours and it's the best you can get. Do a search and find a center near you.