speed Inc. F1A results
Initially we started this build in 2006 with a D1SC and ATI supplied intercoolers and a 370ci LSX motor Speed inc. SC2 camshaft, AFR 225 heads. Power came in at 660rwhp.
Year later owner came back to us to install F1A and FMIC, we went with a custom specification bell intercooler, SD concepts bracket and used full exhaust that contained 4 mufflers. Dyno 801rwhp.

With a few tweeks to the air induction the car dynoed SAE corrected 845rwhp in the owners hometown in Denver.
Present day, swapped to dumped bullet mufflers and file changes. SAE 870rwhp/771rwtq
Last edited by Fraser@SpeedInc; May 27, 2008 at 07:15 PM. Reason: put in up to date picture of under hood
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Now... about the car... you asked for pics... so here ya go! I'll take pics of the mufflers tomorrow and post them. Gotta get the car up in the air. The race exhaust is simple:
Kooks 1 7/8" longtube headers
(2 qty.) Moroso Spiral Flow Race Mufflers 4" Round x 16" Long (stainless)
(2 qty.) Jegs 3" turndowns (Welded to the exits of Moroso Mufflers)
The exhaust dumps under the driver and passengar seats (i.e. pipes do NOT extend to the rear axle). No X-pipe. O2 sensors read fine. The Autometer wideband is welded on at the entrance of one of the Moroso mufflers ... reads fine. The Moroso mufflers are not a full straight through design so you get some backpressure to retain low-end power and keep the O2 sensors reading correctly. The sound is loud and deep ... like a well built race car. The Moroso mufflers actually reduce a fair amount of the raspy sound.
This is a race car ... NOT a street car ... trailered to and from the track. I would NOT recommend running this exhaust setup on the street ... you would just be asking for trouble.
Thanks for all the comments. I'll try to answer questions as best as I can. Reading over a couple of the comments, agreed the car does have more potential / unrealized power. I'll be inching up the power as I continue along.
Eric
Last edited by EBRAMAIR; May 27, 2008 at 11:16 PM.
So any track numbers we need to know??
What tires are you running??
Awesome work everyone at SPeed inc 870rwhp is freakin great with 370ci
So any water pushing?? Damn I love those AFRs.







