What do you find gives you more power?

mdiacont322 · Mar 20, 2010

do you guys find that you get more power out of your 5.7 when you:

1) run open cats

or

2) run a high performance muffler (ex. flowmaster, magnaflow, etc.)

Im wondering because im thinking about taking my flowmaster off (feels like theres no power) and getting the magnaflow 15701 kit in a few weeks.

Gimme some ideas on what you think

Mike

TigerEyz3 · Mar 20, 2010

Can't address your first one... I live in an emissions testing area.
On the second one, I've run both a Delta Flow 50/SUV muffler and now a Magnaflow catback. In both cases, I had my Thorley headers... I far prefer the performance of the Magnaflow.

young_2010_chris · Mar 20, 2010

it helps alot but u need a programmar if u dont like lookin at ur service engine soon lite

AtomicHoe094 · Mar 20, 2010

get some high flow magnaflow cats and a magnaflow muffler and call it a day. still emissions legal too

young_2010_chris · Mar 20, 2010

if u have a saw zaw and a welder its pretty much free tho lol

Brandon X · Mar 20, 2010

Just do one and two. Cut the cat off and use the money from scraping it to buy a nice muffler, and you'll even have money left over! It's a win-win situation!

young_2010_chris · Mar 20, 2010

keep the duals dont y it

mdiacont322 · Mar 22, 2010

ok so i will keep the duals... but what kind of muffler should i slap on for best performance?

blueflamed03 · Mar 22, 2010

are you sure the muffler is what is holding you back?

Clogged cat?

AtomicHoe094 · Mar 22, 2010

blueflamed03 said:
are you sure the muffler is what is holding you back?

Clogged cat?

They want you to replace your cat every 75,000 miles. so if your truck is over that, well maybe it is holding you back

blackcoffee · Mar 22, 2010

Anyone ever had a loss of power after they rid of their Cat's?

AtomicHoe094 · Mar 22, 2010

you shouldnt feel a loss of power.. why do you ask?

young_2010_chris · Mar 22, 2010

i cut mine off then i welded pipe ti my axle then slapped 2 40 seris flows and i could tell a big difference i another thing if u havent done is e-fans i thought it helped alot

---------- Post added at 09:02 PM ---------- Previous post was at 09:01 PM ----------

what year is ur hoe

mdiacont322 · Mar 22, 2010

i guess it is a good possibility that my cats are going bad... i have sputtering when im cruising between 60 and 80. other than that i dont feel anything though... i have my muffler off and it feels like everything freed up since i had the muffler on.

blueflamed03 · Mar 23, 2010

if you need visual, pull the cats off, with a cutting wheel, open the top of it that faces twowards the floor board, beat out all internals, them weld back shut, bolt up. Visually they look OEM stock, inside, they are empty.

AtomicHoe094 · Mar 23, 2010

who needs cats anyways!! lol save that shit on the inside tho! or just scrap the oem one out and buy a brand new one (magnaflow high flow ones) and youll only be like 10bucks in the new one

97yukon · Mar 23, 2010

i cut mine off just recently...loss of bottom end and a gain from top end. apparantly after i get my truck street tuned at futral tom i should see my bottom gains back as well as keeping what i gained in top. if your concerned with emissions deleting the rear o2 sensors clears that right up. thats what i did and it worked like a charm. just a suggestion

mdiacont322 · Mar 24, 2010

how do you delete the rear o2 sensors? and how much bottom end is lost thru hollowing the cats?

WICKEDOWESIX · Mar 24, 2010

mdiacont322 said:
how do you delete the rear o2 sensors? and how much bottom end is lost thru hollowing the cats?

You do it through custom tuning. Also removing your cats does not make you loose low end TQ.

97yukon · Mar 24, 2010

removing my cats did make me loose low end...i got an upgrade to street tune today at futral and he confirmed it. checked my previous stuff after the basic...ive got it back now and some. i had a hypertech before....definitely go custom tuning.

What do you find gives you more power?

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