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Why is the HP so low? I had a 2.0T in my 2008 HHR SS and it was 250HP and then I added the GM Stage kit and it got bumped to 300HP. Maybe they do not want it to be too close to the HP of the V6 or was done for fuel economy reasons.

The original HHR SS Turbo 2.0L used and oversized turbocharger that the supplier had overbuilt and offered to GM at a reduced price. Most of the engine development had been completed with a smaller (but more costly) turbo. Regular production began with the lower cost/oversized turbo for the relatively low number of HHR SS Turbos expected in production.
A group in GM Powertrain- High Performance Vehicle Operations or HPVO- was tasked with using the extra boost to produce a Stage Kit sold to enthusiasts through GM Performance Parts. The engineer driving that package (Bill N) used the higher pressure to optimize the packages performance. A chip provided higher boost, optimal spark and fuel to reach the 300HP level. The entire package then when run through regular dynamometer durability testing to insure compliance with engine warranty. The ‘Kit’ was only available via GM Performance Parts. The HHR SS with the Turbo 2.0L and Stage Kit was thus born.

 

[dpivideo]

The original HHR SS Turbo 2.0L used and oversized turbocharger that the supplier had overbuilt and offered to GM at a reduced price. Most of the engine development had been completed with a smaller (but more costly) turbo. Regular production began with the lower cost/oversized turbo for the relatively low number of HHR SS Turbos expected in production.
A group in GM Powertrain- High Performance Vehicle Operations or HPVO- was tasked with using the extra boost to produce a Stage Kit sold to enthusiasts through GM Performance Parts. The engineer driving that package (Bill N) used the higher pressure to optimize the packages performance. A chip provided higher boost, optimal spark and fuel to reach the 300HP level. The entire package then when run through regular dynamometer durability testing to insure compliance with engine warranty. The ‘Kit’ was only available via GM Performance Parts. The HHR SS with the Turbo 2.0L and Stage Kit was thus born.

... here's mine Image on 2021-05-23 at 22-54-36.png