blackformula69

are these good headers? any real difference in hp gains between these mids and long tubes? any problems fitting? is the catted y pipe good? thank u

Tally TransAm

iTrader: (17)

macs are great, ive been running mine for a while now (about 3 years) with no problems or rust. the collector could use some work, i changed mine to a 3" three bolt style, and the primaries could be ported a bit but for bolt on apps they will perform fine.

lt's will make a little more low end grunt but imo the difference is negligable.

also get the ory or have a catted y pipe custom built, mac cats flow horribly

Ferocity02

iTrader: (60)

Since you are a "newbie", I wont be hard on you, but use the SEARCH button next time.

Here is a recent thread that might help a little:https://ls1tech.com/forums/generation-iii-external-engine/211078-mac-headers.html

Gloveperson

iTrader: (9)

I honeslty think JRP has an army working for him.

Cliffnotes for that thread:

Macs are great headers, flow great, a little less than LT's, more with more mods, their cats flow like crap, good price.

-Todd

jrp

iTrader: (16)

LMMFAO

16nrollininaws6

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