Exhaust system with Flowmsster HP-2 mufflers

Home Page Forums Discussion Topics – Ask the Experts Exhaust system with Flowmsster HP-2 mufflers

Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • #12038
    62cutlassconvert
    Participant

    I will be doing a full dual pipe system on my Cutlass rather than stock and am looking at the 18″Super HP 2 mufflers from Flowmaster. They are very compact, stainless, are insulated and run very cool on the outside, and are often used in close mounting situations according to Flowmaster.. Anyone have any feedback on them?

    #12039
    62cutlassconvert
    Participant

    Here’s a dwg of the muffler.Also available in 12″ length but I think that would be too loud.

    Attachments:
    #12042
    joe_padavano
    Participant

    I considered true duals and chose not to go that way due to the loss of ground clearance. The 61-63 cars have a floor pan with an offset tunnel to allow the single exhaust pipe to fit next to the driveshaft. I found that the Walker 2.5″ cat-back pipe for a fourth-gen F-body fits almost exactly – I had to make some minor tweaks on the bend over the axle. I fabricated a front section that mated to the stock Y-pipe. If an Olds 455 breaths fine with two 2.5″ pipes, a 215 will have more than enough airflow with a single 2.5″ pipe. I also wanted a muffler that fit in the stock location. I finally found a Magnaflow for a third-gen F-body that had a single 2.5″ inlet and two 2.5″ outlets that fit behind the rear axle. Sounds awesome, especially over 3000 RPM.

    Attachments:
    #12047
    62cutlassconvert
    Participant

    Thanks Joe, looks like a good solution. I have an additional problem with ground clearance since we are putting a TH 200 in and have modified the original rear mount which has resulted in lowering it. Haven’t done ground clearance checks yet but may need to fab a custom trans rear mount that gets back up tight to the floor to allow adequate clearance for a pipe or pipes going under it.

    Why did you not go with the available exhaust kit from Waldron’s?

    #12049
    joe_padavano
    Participant

    [quote quote=12047]
    Why did you not go with the available exhaust kit from Waldron’s?

    [/quote]

    Because their system is only a 2″ pipe. Mine is 2.5″. That’s over a 50% increase in flow area. Plus, I wanted an aggressive muffler, not stock-sounding. Plus, I enjoy fabricating stuff like this.

    #12050
    62cutlassconvert
    Participant

    Got it. Similar reason to why I’m looking at other options too I guess. Was hoping it wasn’t fit/quality of Waldron’s.

Viewing 6 posts - 1 through 6 (of 6 total)
  • You must be logged in to reply to this topic.

Recent Articles

Turbo System Safety Checks

Turbo System Safety Checks

The safety components of the factory designed turbo system have some interactive groups of safety "c...(read article)

Engine Front Drive Pulleys

Engine Front Drive Pulleys

The standard drive pulley has one groove. It drives the water pump/fan and alternator or generator. ...(read article)

1961-1963 F85 Car and Option Prices

1961-1963 F85 Car and Option Prices

Attached to this article is PDF file containing an extensive list of car and option pricing for 1961...(read article)

Recently Active Members

Profile picture of johnsage
Profile picture of jensenracing77
Profile picture of joe_padavano
Profile picture of oaklyss
Profile picture of 62cutlassconvert

OldsJetfire Forum