Member Credit: Whore-Jay

The SSIM (Secret Sauce Intake Manifold) was created years ago by member SR20DEN. This involves cutting the shelf out of the main chamber of the upper intake manifold and removing the VIAS assembly. This will still lose a little low end power, but the gains in the top end are very noticeable. It’s definitely a modification that is worthwhile.

Below are the results of 3 different Intake Manifold setups. All runs done on the same dyno with the same AFR (tuned for 13) and around the same temp. Stock (runfile11), SSIM (runfile10), VIAS delete (runfile7). Your constructive input is welcome but I am not here to argue about any of my results, this is what I did and that is what I got end of story so please no flaming. Enjoy!!!

Stock IM with functional VIAS.

Stock IM with VIAS deleted, NWP Block plate used.

SSIM with VIAS deleted, NWP Block plate used.

All three HP overlay.

All three TQ overlay.

All data combined.

My thoughts on the SSIM vs Stock.

  • First of all I am suprised that the SSIM did so poorly when compared to both the Stock setup and the VIAS delete.
  • It posted losses across the board, it only begun to edge out the stock setup after 5600rpm with a gain of 12hp
  • at 6300rpm.
  • Against the VIAS delete setup it made the same peak power but posted some gains after 6100rpm, average of 5hp with a peak of 7hp at 6500.
  • It was totally killed by the Stock setup from 2500rpm until 3800rpm, max of 24tq at 3400rpm. Never made any gains in usable torque.
  • Killed by the Stock setup for HP as well, losses from 2500rpm until 3900rpm, an average of 10hp with a peak of 16hp at 3500rpm lost to the stock setup.
  • From 3900 until 5600 they were about the same.

My thoughts on the VIAS delete vs Stock.

  • 3800rpm seems to be the magic number in this comparison. Below 3800 the Stock setup is better but after that its all gains with the NWP Blockplate and the VIAS delete!!!
  • From 3800 all the way to redline with the VIAS delete I showed an average 8hp gain across the board with a peak of 10.5hp at 6000.
  • From 2700 until 3800 the Stock setup was good for an average of 8hp over the VIAS delete with a peak of 9hp at 3400.
  • From 3800 until redline the VIAS delete made an average of 8tq more with a peak of 10.5tq at 4200.
  • From 2800 until 3800 the Stock setup was good for an average of 10tq more with a peak of 16tq more at 3400.

The verdict….. Its really just up to what you want to drive with, I am choosing the NWP Block plate with an unmodifed IM for now. 

  • I like the power from 3800rpm until redline rather than power below 3800rpm, I feel the losses down that low are worth the gains I see up high. When I stomp on the gas I dont stay below 3800 for very long, this makes the VIAS delete a beneficial mod IMHO.
  • The gains from the SSIM is irrelevant since it only starts to make HP after 6100rpm and totally destroyed all low end torque. Since I run out of engine the SSIM may be a viable option with a TS ECU and a higher redline, timing etc, etc.


  • Unorthodox racing UDP
  • SSAC headers (no cat)
  • 2.5″ Catback
  • Magnaflow 27X6″ resonator
  • Stillen Exhaust
  • Frankencar WAI
  • Tuned APEXI NEO


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