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2K C5 Fast Intake

This is a discussion on 2K C5 Fast Intake within the Corvette forums, part of the Vehicle Specific category; I talked to a local performance shop about a Fast intake for 2K C5. I asked if I should go ...

  1. #1
    Junior Member cruzc5frc's Avatar
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    2K C5 Fast Intake

    I talked to a local performance shop about a Fast intake for 2K C5. I asked if I should go with Fast 90mm TB to compliment it, they said go LS6 TB due to the bolt lineups. Anyone to concur or clarify?

  2. #2
    Just another Joe Eagle's Avatar
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    Until you have supporting mods, the 90mm is over kill. The TB alone will cost ya another ~$450! The 78mm TB can handle 500HP with a lil porting & polishing that someone should be able to do for you for around $150 with the bump stop mod included.

    However, if you plan to do forced induction, heads/cam/rockers, and full exhaust upgrades then the 90mm starts making sense if your wallet can swing it.

    -Eagle

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    rebmeM roineS NemesisZ06's Avatar
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    I agree with the above.

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    Junior Member cruzc5frc's Avatar
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    Agreed, LT headers is top on the list

    current mods:
    corsa pace car setup w/ corsa xpipe
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    replaced audio system, new alpine head unit, alpine type R 6.5" all around, 10" Alpine Type R sub, 2F CAP, MRP-F550 4 channel amp, MRP-F850 bridged to two ohm to power the single 10. (go loud parts)

  5. #5
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    2000 Corvette

    Fast opinions:

    Great intake when going big N/A (450+ RWHP).
    Great for porting, expensive for what it is but when done by the right people can show impressive gains throughout the RPM band well worth the cost.
    Not so much gains in F/I, some people have mentioned the possibilty of boost leak since the unit is not one solid piece.

    If you put a FAST 90 you need a 90mm T/B. I believe the FAST 78 works with stockers but I am not sure. If you are doing a FAST though go all the way and do the 90 setup. I had bought a used FAST 90 with a Mamo port job and a 90mm Nick Williams T/B for 1150 but decided to put on a blower and sold the setup, never got to see what it did but others estimate that I would have picked up 20-25 at the wheels throughout most of the RPM band. This was over an LS6 intake with a Shaner ported T/B.

    I will always wonder......

  6. #6
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    2K C5 Fast Intake

    The GM LS6 intake is worth about 10 hp over your factory LS1 intake. Unless you perform several other mods such as heads, cam, headers, etc., you will not see an appreciable gain, and possibly a loss, with the FAST intake and TB. If you do go with the FAST, the 78mm will not give a noticiable gain over the LS6, however, if your car is heavily modified, the 90mm FAST intake and TB will give a noticable increase in power and torque throughout the entire rpm range. I gained 18 hp and 18 tq when switching from the LS6 to the 90mm FAST but my car was heavily modded and the intake was the restriction at that point.

  7. #7
    Member Frosty's Avatar
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    I agree with what was said. a FAST 90 is overkill on a relatively stock motor.
    -98 GTP Coupe. Silvermist and stock.

    -89 GTA*** L98, P1-SC, 24# SVO's, MSD 6-A, March underdrive pulleys, Edelbrock headers/catback and some other goodies.

    ~Tony

  8. #8
    Member ApexVIII's Avatar
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    Quote Originally Posted by DBN View Post
    The GM LS6 intake is worth about 10 hp over your factory LS1 intake. Unless you perform several other mods such as heads, cam, headers, etc., you will not see an appreciable gain, and possibly a loss, with the FAST intake and TB. If you do go with the FAST, the 78mm will not give a noticiable gain over the LS6, however, if your car is heavily modified, the 90mm FAST intake and TB will give a noticable increase in power and torque throughout the entire rpm range. I gained 18 hp and 18 tq when switching from the LS6 to the 90mm FAST but my car was heavily modded and the intake was the restriction at that point.
    i would go with the stock ls6 intake.
    M6, Lid, Ported and Polished Throttle Body (By Me!), LT, Custom Catted Y, Electric Cutout, PHB, LCA13.21@108 with a 2.3 60'

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    Senior Member Wheeler99WS6's Avatar
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    I dont think a LS6 TB will bolt up to a FAST 90mm, I believe the bolt pattern is different. I believe that was your original question.

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