quick mid-length header question
quick mid-length header question I just bought some Mac mid-length headers which should arrive sometime today via FedEx and I was wondering....do I need o2 extensions with th emid-length headers? some have told me yes and others say no.
i couldnt get them in from the bottom on my macs. i took off the valve covers and slid them in from the top. it was tight on the drivers side and i used a mallet to get them past the column without any ill effects
Mine went in from the top. I seemed to remember the driver side going in with out a problem but I had to take the off EGR valve and coil rail on the pass side.
I haven't dynoed the Formula but my last LS1 car got 50rwhp and 40ft tq untuned. That was going from bone stock to Mac headers and a lid.
I haven't dynoed the Formula but my last LS1 car got 50rwhp and 40ft tq untuned. That was going from bone stock to Mac headers and a lid.
Trending Topics
I put them in from the bottom, took both coil packs off. Did have to remove the oil filter and grind down the infamous block that sticks out. Other than that no problems other than the egr/air stuff. No extensions needed just undo where the O2s are hooked into for movement issues. Picked up 15-20hp at the wheels.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
I didn't need the O2 extensions either.
Mine went in from the bottom with the block grindage ad mentioned above and only picked up around 15 hp.
The only way I could see picking up 50 whp from Macs and a lid is if the cats were clogged or you are comparing a pull on a mustang dyno to a dynojet.
Mine went in from the bottom with the block grindage ad mentioned above and only picked up around 15 hp.
The only way I could see picking up 50 whp from Macs and a lid is if the cats were clogged or you are comparing a pull on a mustang dyno to a dynojet.
I didn't need the O2 extensions either.
Mine went in from the bottom with the block grindage ad mentioned above and only picked up around 15 hp.
The only way I could see picking up 50 whp from Macs and a lid is if the cats were clogged or you are comparing a pull on a mustang dyno to a dynojet.
Mine went in from the bottom with the block grindage ad mentioned above and only picked up around 15 hp.
The only way I could see picking up 50 whp from Macs and a lid is if the cats were clogged or you are comparing a pull on a mustang dyno to a dynojet.
